diff --git a/package-lock.json b/package-lock.json
index 5a52dc1..7153570 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -910,7 +910,8 @@
     "@google-cloud/promisify": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/@google-cloud/promisify/-/promisify-0.4.0.tgz",
-      "integrity": "sha512-4yAHDC52TEMCNcMzVC8WlqnKKKq+Ssi2lXoUg9zWWkZ6U6tq9ZBRYLHHCRdfU+EU9YJsVmivwGcKYCjRGjnf4Q=="
+      "integrity": "sha512-4yAHDC52TEMCNcMzVC8WlqnKKKq+Ssi2lXoUg9zWWkZ6U6tq9ZBRYLHHCRdfU+EU9YJsVmivwGcKYCjRGjnf4Q==",
+      "optional": true
     },
     "@google-cloud/storage": {
       "version": "2.5.0",
@@ -1924,12 +1925,14 @@
     "arrify": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/arrify/-/arrify-1.0.1.tgz",
-      "integrity": "sha1-iYUI2iIm84DfkEcoRWhJwVAaSw0="
+      "integrity": "sha1-iYUI2iIm84DfkEcoRWhJwVAaSw0=",
+      "optional": true
     },
     "ascli": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/ascli/-/ascli-1.0.1.tgz",
       "integrity": "sha1-vPpZdKYvGOgcq660lzKrSoj5Brw=",
+      "optional": true,
       "requires": {
         "colour": "~0.7.1",
         "optjs": "~3.2.2"
@@ -2389,6 +2392,7 @@
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/bytebuffer/-/bytebuffer-5.0.1.tgz",
       "integrity": "sha1-WC7qSxqHO20CCkjVjfhfC7ps/d0=",
+      "optional": true,
       "requires": {
         "long": "~3"
       },
@@ -2396,7 +2400,8 @@
         "long": {
           "version": "3.2.0",
           "resolved": "https://registry.npmjs.org/long/-/long-3.2.0.tgz",
-          "integrity": "sha1-2CG3E4yhy1gcFymQ7xTbIAtcR0s="
+          "integrity": "sha1-2CG3E4yhy1gcFymQ7xTbIAtcR0s=",
+          "optional": true
         }
       }
     },
@@ -2637,7 +2642,8 @@
     "colour": {
       "version": "0.7.1",
       "resolved": "https://registry.npmjs.org/colour/-/colour-0.7.1.tgz",
-      "integrity": "sha1-nLFpkX7F0SwHNtPoaFdG3xyt93g="
+      "integrity": "sha1-nLFpkX7F0SwHNtPoaFdG3xyt93g=",
+      "optional": true
     },
     "combined-stream": {
       "version": "1.0.7",
@@ -3118,6 +3124,7 @@
       "version": "3.7.1",
       "resolved": "https://registry.npmjs.org/duplexify/-/duplexify-3.7.1.tgz",
       "integrity": "sha512-07z8uv2wMyS51kKhD1KsdXJg5WQ6t93RneqRxUHnskXVtlYYkLqM0gqStQZ3pj073g687jPCHrqNfCzawLYh5g==",
+      "optional": true,
       "requires": {
         "end-of-stream": "^1.0.0",
         "inherits": "^2.0.1",
@@ -4248,7 +4255,8 @@
         "ansi-regex": {
           "version": "2.1.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "aproba": {
           "version": "1.2.0",
@@ -4269,12 +4277,14 @@
         "balanced-match": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "brace-expansion": {
           "version": "1.1.11",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "balanced-match": "^1.0.0",
             "concat-map": "0.0.1"
@@ -4289,17 +4299,20 @@
         "code-point-at": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "concat-map": {
           "version": "0.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "console-control-strings": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "core-util-is": {
           "version": "1.0.2",
@@ -4416,7 +4429,8 @@
         "inherits": {
           "version": "2.0.3",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "ini": {
           "version": "1.3.5",
@@ -4428,6 +4442,7 @@
           "version": "1.0.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "number-is-nan": "^1.0.0"
           }
@@ -4442,6 +4457,7 @@
           "version": "3.0.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "brace-expansion": "^1.1.7"
           }
@@ -4449,12 +4465,14 @@
         "minimist": {
           "version": "0.0.8",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "minipass": {
           "version": "2.3.5",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "safe-buffer": "^5.1.2",
             "yallist": "^3.0.0"
@@ -4473,6 +4491,7 @@
           "version": "0.5.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -4553,7 +4572,8 @@
         "number-is-nan": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "object-assign": {
           "version": "4.1.1",
@@ -4565,6 +4585,7 @@
           "version": "1.4.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "wrappy": "1"
           }
@@ -4650,7 +4671,8 @@
         "safe-buffer": {
           "version": "5.1.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "safer-buffer": {
           "version": "2.1.2",
@@ -4686,6 +4708,7 @@
           "version": "1.0.2",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",
@@ -4705,6 +4728,7 @@
           "version": "3.0.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "ansi-regex": "^2.0.0"
           }
@@ -4748,12 +4772,14 @@
         "wrappy": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "yallist": {
           "version": "3.0.3",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         }
       }
     },
@@ -5099,6 +5125,7 @@
       "version": "1.19.0",
       "resolved": "https://registry.npmjs.org/grpc/-/grpc-1.19.0.tgz",
       "integrity": "sha512-xX+jZ1M3YXjngsRj/gTxB4EwM0WoWUr54DmyNq9xTeg1oSuVaTPD/PK9wnZKOJWTt1pkeFspXqwJPhddZNxHOA==",
+      "optional": true,
       "requires": {
         "lodash.camelcase": "^4.3.0",
         "lodash.clone": "^4.5.0",
@@ -5109,19 +5136,23 @@
       "dependencies": {
         "abbrev": {
           "version": "1.1.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "ansi-regex": {
           "version": "2.1.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "aproba": {
           "version": "1.2.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "are-we-there-yet": {
           "version": "1.1.5",
           "bundled": true,
+          "optional": true,
           "requires": {
             "delegates": "^1.0.0",
             "readable-stream": "^2.0.6"
@@ -5129,11 +5160,13 @@
         },
         "balanced-match": {
           "version": "1.0.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "brace-expansion": {
           "version": "1.1.11",
           "bundled": true,
+          "optional": true,
           "requires": {
             "balanced-match": "^1.0.0",
             "concat-map": "0.0.1"
@@ -5142,16 +5175,19 @@
         "camelcase": {
           "version": "2.1.1",
           "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-2.1.1.tgz",
-          "integrity": "sha1-fB0W1nmhu+WcoCys7PsBHiAfWh8="
+          "integrity": "sha1-fB0W1nmhu+WcoCys7PsBHiAfWh8=",
+          "optional": true
         },
         "chownr": {
           "version": "1.1.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "cliui": {
           "version": "3.2.0",
           "resolved": "https://registry.npmjs.org/cliui/-/cliui-3.2.0.tgz",
           "integrity": "sha1-EgYBU3qRbSmUD5NNo7SNWFo5IT0=",
+          "optional": true,
           "requires": {
             "string-width": "^1.0.1",
             "strip-ansi": "^3.0.1",
@@ -5160,53 +5196,64 @@
         },
         "code-point-at": {
           "version": "1.1.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "concat-map": {
           "version": "0.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "console-control-strings": {
           "version": "1.1.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "core-util-is": {
           "version": "1.0.2",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "debug": {
           "version": "2.6.9",
           "bundled": true,
+          "optional": true,
           "requires": {
             "ms": "2.0.0"
           }
         },
         "deep-extend": {
           "version": "0.6.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "delegates": {
           "version": "1.0.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "detect-libc": {
           "version": "1.0.3",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "fs-minipass": {
           "version": "1.2.5",
           "bundled": true,
+          "optional": true,
           "requires": {
             "minipass": "^2.2.1"
           }
         },
         "fs.realpath": {
           "version": "1.0.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "gauge": {
           "version": "2.7.4",
           "bundled": true,
+          "optional": true,
           "requires": {
             "aproba": "^1.0.3",
             "console-control-strings": "^1.0.0",
@@ -5221,6 +5268,7 @@
         "glob": {
           "version": "7.1.2",
           "bundled": true,
+          "optional": true,
           "requires": {
             "fs.realpath": "^1.0.0",
             "inflight": "^1.0.4",
@@ -5232,11 +5280,13 @@
         },
         "has-unicode": {
           "version": "2.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "iconv-lite": {
           "version": "0.4.23",
           "bundled": true,
+          "optional": true,
           "requires": {
             "safer-buffer": ">= 2.1.2 < 3"
           }
@@ -5244,6 +5294,7 @@
         "ignore-walk": {
           "version": "3.0.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "minimatch": "^3.0.4"
           }
@@ -5251,6 +5302,7 @@
         "inflight": {
           "version": "1.0.6",
           "bundled": true,
+          "optional": true,
           "requires": {
             "once": "^1.3.0",
             "wrappy": "1"
@@ -5258,32 +5310,38 @@
         },
         "inherits": {
           "version": "2.0.3",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "ini": {
           "version": "1.3.5",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "invert-kv": {
           "version": "1.0.0",
           "resolved": "https://registry.npmjs.org/invert-kv/-/invert-kv-1.0.0.tgz",
-          "integrity": "sha1-EEqOSqym09jNFXqO+L+rLXo//bY="
+          "integrity": "sha1-EEqOSqym09jNFXqO+L+rLXo//bY=",
+          "optional": true
         },
         "is-fullwidth-code-point": {
           "version": "1.0.0",
           "bundled": true,
+          "optional": true,
           "requires": {
             "number-is-nan": "^1.0.0"
           }
         },
         "isarray": {
           "version": "1.0.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "lcid": {
           "version": "1.0.0",
           "resolved": "https://registry.npmjs.org/lcid/-/lcid-1.0.0.tgz",
           "integrity": "sha1-MIrMr6C8SDo4Z7S28rlQYlHRuDU=",
+          "optional": true,
           "requires": {
             "invert-kv": "^1.0.0"
           }
@@ -5291,17 +5349,20 @@
         "minimatch": {
           "version": "3.0.4",
           "bundled": true,
+          "optional": true,
           "requires": {
             "brace-expansion": "^1.1.7"
           }
         },
         "minimist": {
           "version": "1.2.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "minipass": {
           "version": "2.3.5",
           "bundled": true,
+          "optional": true,
           "requires": {
             "safe-buffer": "^5.1.2",
             "yallist": "^3.0.0"
@@ -5310,6 +5371,7 @@
         "minizlib": {
           "version": "1.1.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "minipass": "^2.2.1"
           }
@@ -5317,23 +5379,27 @@
         "mkdirp": {
           "version": "0.5.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           },
           "dependencies": {
             "minimist": {
               "version": "0.0.8",
-              "bundled": true
+              "bundled": true,
+              "optional": true
             }
           }
         },
         "ms": {
           "version": "2.0.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "needle": {
           "version": "2.2.4",
           "bundled": true,
+          "optional": true,
           "requires": {
             "debug": "^2.1.2",
             "iconv-lite": "^0.4.4",
@@ -5343,6 +5409,7 @@
         "node-pre-gyp": {
           "version": "0.12.0",
           "bundled": true,
+          "optional": true,
           "requires": {
             "detect-libc": "^1.0.2",
             "mkdirp": "^0.5.1",
@@ -5359,6 +5426,7 @@
         "nopt": {
           "version": "4.0.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "abbrev": "1",
             "osenv": "^0.1.4"
@@ -5366,11 +5434,13 @@
         },
         "npm-bundled": {
           "version": "1.0.5",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "npm-packlist": {
           "version": "1.1.12",
           "bundled": true,
+          "optional": true,
           "requires": {
             "ignore-walk": "^3.0.1",
             "npm-bundled": "^1.0.1"
@@ -5379,6 +5449,7 @@
         "npmlog": {
           "version": "4.1.2",
           "bundled": true,
+          "optional": true,
           "requires": {
             "are-we-there-yet": "~1.1.2",
             "console-control-strings": "~1.1.0",
@@ -5388,38 +5459,45 @@
         },
         "number-is-nan": {
           "version": "1.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "object-assign": {
           "version": "4.1.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "once": {
           "version": "1.4.0",
           "bundled": true,
+          "optional": true,
           "requires": {
             "wrappy": "1"
           }
         },
         "os-homedir": {
           "version": "1.0.2",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "os-locale": {
           "version": "1.4.0",
           "resolved": "https://registry.npmjs.org/os-locale/-/os-locale-1.4.0.tgz",
           "integrity": "sha1-IPnxeuKe00XoveWDsT0gCYA8FNk=",
+          "optional": true,
           "requires": {
             "lcid": "^1.0.0"
           }
         },
         "os-tmpdir": {
           "version": "1.0.2",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "osenv": {
           "version": "0.1.5",
           "bundled": true,
+          "optional": true,
           "requires": {
             "os-homedir": "^1.0.0",
             "os-tmpdir": "^1.0.0"
@@ -5427,16 +5505,19 @@
         },
         "path-is-absolute": {
           "version": "1.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "process-nextick-args": {
           "version": "2.0.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "protobufjs": {
           "version": "5.0.3",
           "resolved": "https://registry.npmjs.org/protobufjs/-/protobufjs-5.0.3.tgz",
           "integrity": "sha512-55Kcx1MhPZX0zTbVosMQEO5R6/rikNXd9b6RQK4KSPcrSIIwoXTtebIczUrXlwaSrbz4x8XUVThGPob1n8I4QA==",
+          "optional": true,
           "requires": {
             "ascli": "~1",
             "bytebuffer": "~5",
@@ -5447,6 +5528,7 @@
         "rc": {
           "version": "1.2.8",
           "bundled": true,
+          "optional": true,
           "requires": {
             "deep-extend": "^0.6.0",
             "ini": "~1.3.0",
@@ -5457,6 +5539,7 @@
         "readable-stream": {
           "version": "2.3.6",
           "bundled": true,
+          "optional": true,
           "requires": {
             "core-util-is": "~1.0.0",
             "inherits": "~2.0.3",
@@ -5470,37 +5553,45 @@
         "rimraf": {
           "version": "2.6.2",
           "bundled": true,
+          "optional": true,
           "requires": {
             "glob": "^7.0.5"
           }
         },
         "safe-buffer": {
           "version": "5.1.2",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "safer-buffer": {
           "version": "2.1.2",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "sax": {
           "version": "1.2.4",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "semver": {
           "version": "5.6.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "set-blocking": {
           "version": "2.0.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "signal-exit": {
           "version": "3.0.2",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "string-width": {
           "version": "1.0.2",
           "bundled": true,
+          "optional": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",
@@ -5510,6 +5601,7 @@
         "string_decoder": {
           "version": "1.1.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "safe-buffer": "~5.1.0"
           }
@@ -5517,17 +5609,20 @@
         "strip-ansi": {
           "version": "3.0.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "ansi-regex": "^2.0.0"
           }
         },
         "strip-json-comments": {
           "version": "2.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "tar": {
           "version": "4.4.8",
           "bundled": true,
+          "optional": true,
           "requires": {
             "chownr": "^1.1.1",
             "fs-minipass": "^1.2.5",
@@ -5540,32 +5635,38 @@
         },
         "util-deprecate": {
           "version": "1.0.2",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "wide-align": {
           "version": "1.1.3",
           "bundled": true,
+          "optional": true,
           "requires": {
             "string-width": "^1.0.2 || 2"
           }
         },
         "wrappy": {
           "version": "1.0.2",
-          "bundled": true
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