Update Typescript to 2.0

Updating graphql-tag was also required because its incorect types definition
was raising errors with TS 2.0, see apollographql/graphql-tag#1.

I haven’t opt-in for the `strictNullChecks` option yet, for that’s certainly
something to do to get the full benefit of this new TS release.

Author: Maxime Quandalle

package.json

@@ -38,7 +38,7 @@
   "license": "MIT",
   "dependencies": {
     "es6-promise": "^3.1.2",
-    "graphql-tag": "^0.1.8",
+    "graphql-tag": "^0.1.10",
     "lodash.assign": "^4.0.8",
     "lodash.clonedeep": "^4.3.2",
     "lodash.countby": "^4.4.0",
@@ -88,7 +88,7 @@
     "sinon": "^1.17.4",
     "source-map-support": "^0.4.0",
     "tslint": "3.13.0",
-    "typescript": "^1.8.9",
+    "typescript": "^2.0.0",
     "typings": "^1.0.0",
     "uglify-js": "^2.6.2"
   }