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/src/change_detection/interfaces.ts

@@ -68,4 +68,4 @@ export class ChangeDetectorDefinition {
   constructor(public id: string, public strategy: string, public variableNames: List<string>,
               public bindingRecords: List<BindingRecord>,
               public directiveRecords: List<DirectiveRecord>) {}
-}
+}