build: consolidate tsc to ease migration to @types/ based typings delivery

I actually tried to use @types/* directly but came across several issues which prevented me
from switching over:
- https://github.com/Microsoft/TypeScript/issues/8715
- https://github.com/Microsoft/TypeScript/issues/8723

modules/@angular/http/tsconfig-es5.json

@@ -17,14 +17,12 @@
     "rootDir": ".",
     "sourceMap": true,
     "inlineSources": true,
+    "lib": ["es6", "dom"],
     "target": "es5"
   },
   "files": [
     "index.ts",
     "testing.ts",
-    "../typings/es6-collections/es6-collections.d.ts",
-    "../typings/es6-promise/es6-promise.d.ts",
-    "../manual_typings/globals.d.ts",
     "../../../node_modules/zone.js/dist/zone.js.d.ts"
   ]
 }