Update Typescript to 2.0

Updating graphql-tag was also required because it’s 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: mquandalle

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"
  }