chore: update to TS2.0

This PR updates TypeScript from 1.8.10 to 2.0.2. It does not replace `typings` with `@types`, that will happen in #157.

package.json

@@ -32,6 +32,8 @@
     "@angular/router":  "3.0.0-rc.3",
     "@angular/upgrade":  "2.0.0-rc.7",
 
+    "typescript": "^2.0.2",
+    "typings": "^1.0.4",
     "systemjs": "0.19.27",
     "core-js": "^2.4.1",
     "reflect-metadata": "^0.1.3",
@@ -44,8 +46,6 @@
   "devDependencies": {
     "concurrently": "^2.2.0",
     "lite-server": "^2.2.0",
-    "typescript": "^1.8.10",
-    "typings": "^1.0.4",
 
     "canonical-path": "0.0.2",
     "http-server": "^0.9.0",