refactor(compiler): remove unused code

BREAKING CHANGE:
- Removes `ChangeDetection`, use a binding for `ChangeDetectorGenConfig` instead
  to configure change detection.
- `RenderElementRef.renderBoundElementIndex` was renamed to `RenderElementRef.boundElementIndex`.
- Removes `ViewLoader`, use `XHRImpl` instead.

modules/angular2/src/compiler/change_definition_factory.ts

@@ -3,11 +3,9 @@ import {isPresent, isBlank} from 'angular2/src/core/facade/lang';
 import {reflector} from 'angular2/src/core/reflection/reflection';
 
 import {
-  ChangeDetection,
   DirectiveIndex,
   BindingRecord,
   DirectiveRecord,
-  ProtoChangeDetector,
   ChangeDetectionStrategy,
   ChangeDetectorDefinition,
   ChangeDetectorGenConfig,