Misc minor changes (angular#205)

* refactor(providers): allow offline compilation

* chore(npm): automatically install typings on npm i

Author: vicb

package.json

@@ -8,7 +8,7 @@
     "test": "npm run build; karma start",
     "docs": "typedoc --out docs/api/ --module commonjs --mode modules --name AngularFire2 src",
     "build": "rm -rf dist; tsc",
-    "build_npm": "rm -rf dist && ./node_modules/.bin/tsc -p tsconfig.publish.es5.json && ./node_modules/.bin/tsc -p tsconfig.publish.es6.json",
+    "build_npm": "rm -rf dist && tsc -p tsconfig.publish.es5.json && tsc -p tsconfig.publish.es6.json",
     "postbuild_npm": "cp manual_typings/firebase3/firebase3.d.ts package.json README.md .npmignore dist/ && npm run rewrite_npm_package",
     "rewrite_npm_package": "node --harmony_destructuring tools/rewrite-published-package.js",
     "build_bundle": "cp -r src angularfire2 && tsc typings/main.d.ts angularfire2.ts --rootDir . --module system -t es5 --outFile dist/bundles/angularfire2.js  --moduleResolution node --emitDecoratorMetadata --experimentalDecorators",

src/angularfire2.ts

@@ -31,32 +31,37 @@ export class AngularFire {
 }
 
 export const COMMON_PROVIDERS: any[] = [
-  provide(FirebaseApp, {
-    useFactory: (config: FirebaseAppConfig) => {
-      return initializeApp(config);
-    },
-    deps: [FirebaseConfig]}),
   // TODO: Deprecate
   provide(FirebaseAuth, {
     useExisting: AngularFireAuth
   }),
+  {
+    provide: FirebaseApp,
+    useFactory: _getFirebase,
+    deps: [FirebaseConfig]
+  },
   AngularFireAuth,
   AngularFire,
-  FirebaseDatabase,
+  FirebaseDatabase
 ];
 
-function _getFirebase(url:string): Firebase {
-  return new Firebase(url);
+function _getFirebase(config: FirebaseAppConfig): firebase.app.App {
+  return initializeApp(config);
 }
 
 export const FIREBASE_PROVIDERS:any[] = [
   COMMON_PROVIDERS,
-  provide(AuthBackend, {
-    useFactory: (app: firebase.app.App) => new FirebaseSdkAuthBackend(app, false),
+  {
+    provide: AuthBackend,
+    useFactory: _getAuthBackend,
     deps: [FirebaseApp]
-  })
+  }
 ];
 
+function _getAuthBackend(app: firebase.app.App): FirebaseSdkAuthBackend {
+  return new FirebaseSdkAuthBackend(app, false);
+}
+
 /**
  * Used to define the default Firebase root location to be
  * used throughout an application.