Update dependencies and builds

- Add hi-sd package for Firefox Nightly
- Update dependencies
  - custom-elements to 1.0.8
  - html-imports to 1.1.1
  - shadycss to 1.1.1
  - shadydom to 1.0.12

.gitattributes

@@ -1,3 +1,4 @@
 /webcomponents*.js binary
 /webcomponents*.js.map binary
-/webcomponents-loader.js -binary
+/webcomponents-loader.js -binary
+/package-lock.json binary

package.json

@@ -27,28 +27,28 @@
   },
   "homepage": "https://webcomponents.org/polyfills",
   "devDependencies": {
-    "@webcomponents/custom-elements": "^1.0.6",
-    "@webcomponents/html-imports": "^1.1.0",
-    "@webcomponents/shadycss": "^1.1.0",
-    "@webcomponents/shadydom": "^1.0.11",
+    "@webcomponents/custom-elements": "^1.0.8",
+    "@webcomponents/html-imports": "^1.1.1",
+    "@webcomponents/shadycss": "^1.1.1",
+    "@webcomponents/shadydom": "^1.0.12",
     "@webcomponents/template": "^1.2.2",
     "@webcomponents/webcomponents-platform": "^1.0.0",
     "babel-preset-minify": "^0.2.0",
     "del": "^3.0.0",
-    "es6-promise": "^4.1.1",
-    "eslint": "^4.13.1",
+    "es6-promise": "4.1.x",
+    "eslint": "^4.16.0",
     "google-closure-compiler": "^20171203.0.0",
     "gulp": "^3.8.8",
     "gulp-add-src": "^0.2.0",
     "gulp-header": "^1.8.9",
     "gulp-rename": "^1.2.2",
-    "gulp-sourcemaps": "^2.4.1",
+    "gulp-sourcemaps": "^2.6.4",
     "rollup-plugin-babel": "^2.7.1",
     "rollup-stream": "=1.23",
-    "run-sequence": "^2.0.0",
-    "vinyl-buffer": "^1.0.0",
-    "vinyl-source-stream": "^1.1.0",
-    "web-component-tester": "^6.4.1"
+    "run-sequence": "^2.2.1",
+    "vinyl-buffer": "^1.0.1",
+    "vinyl-source-stream": "^1.1.2",
+    "web-component-tester": "^6.5.0"
   },
   "publishConfig": {
     "access": "public"