fix(angular/cli): Use package.json fields: 'typings', 'main', 'jsnext…

…:main'

Point 'main' to the commonjs es5 files (lib/index.js)
Point 'jsnext:main' to ESM files (lib-esm/index.js)
Point 'typings' to typings in es5 dir (lib/index.d.ts)

What didn't work:
- Pointing 'main' to the UMD bundle
- Replacing 'jsnext:main' with 'module'
- Pointing 'typings' to typings in ESM dir (lib-esm/index.d.ts)

package.json

@@ -56,9 +56,9 @@
   "engines": {
     "node": ">=4.0.0"
   },
-  "main": "_bundles/ui-router-core.js",
-  "jsnext:main": "lib-esm/index.js",
   "typings": "lib/index.d.ts",
+  "main": "lib/index.js",
+  "jsnext:main": "lib-esm/index.js",
   "license": "MIT",
   "devDependencies": {
     "@types/jasmine": "^2.5.47",