refactor(proto_view_factory): expose data for generating change detectors

Also consolidates metadata handling in `ElementInjector`

BREAKING CHANGE:
- renames `DirectiveMetadataReader` into `DirectiveResolver`
  and removes `src/core/compiler/directive_metadata`.

Fixes #1712
Fixes #1713

modules/angular2/test/router/router_spec.js

@@ -16,7 +16,7 @@ import {SpyLocation} from 'angular2/src/mock/location_mock'
 import {Location} from 'angular2/src/router/location';
 
 import {RouteRegistry} from 'angular2/src/router/route_registry';
-import {DirectiveMetadataReader} from 'angular2/src/core/compiler/directive_metadata_reader';
+import {DirectiveResolver} from 'angular2/src/core/compiler/directive_resolver';
 
 import {bind} from 'angular2/di';
 
@@ -28,7 +28,7 @@ export function main() {
     beforeEachBindings(() => [
       Pipeline,
       RouteRegistry,
-      DirectiveMetadataReader,
+      DirectiveResolver,
       bind(Location).toClass(SpyLocation),
       bind(Router).toFactory((registry, pipeline, location) => {
         return new RootRouter(registry, pipeline, location, AppCmp);