refactor: rename annotations to metadata

BREAKING CHANGE (maybe)

Well as long as our customers use public API this should not be a
breaking change, but we have changed import structure as well as
internal names, so it could be breaking.

import:
  angular2/annotations => angular2/metadata

Classes:
  *Annotations => *Metadata
  renderer.DirectiveMetadata => renderer.RendererDirectiveMetadata
  renderer.ElementBinder => renderer.RendererElementBinder
  impl.Directive => impl.DirectiveMetadata
  impl.Component => impl.ComponentMetadata
  impl.View => impl.ViewMetadata

Closes #3660

modules/angular2/src/core/pipes/pipe_binding.ts

@@ -1,15 +1,15 @@
 import {Type} from 'angular2/src/facade/lang';
 import {Key, Dependency, ResolvedBinding, Binding} from 'angular2/di';
-import {Pipe} from 'angular2/src/core/annotations_impl/annotations';
+import {PipeMetadata} from '../metadata/directives';
 
 export class PipeBinding extends ResolvedBinding {
   constructor(public name: string, key: Key, factory: Function, dependencies: Dependency[]) {
     super(key, factory, dependencies);
   }
 
-  static createFromType(type: Type, metadata: Pipe): PipeBinding {
+  static createFromType(type: Type, metadata: PipeMetadata): PipeBinding {
     var binding = new Binding(type, {toClass: type});
     var rb = binding.resolve();
     return new PipeBinding(metadata.name, rb.key, rb.factory, rb.dependencies);
   }
-}
+}

modules/angular2/src/core/pipes/pipes.ts

@@ -5,7 +5,7 @@ import * as cd from 'angular2/src/change_detection/pipes';
 
 export class ProtoPipes {
   /**
-   * Map of {@link Pipe} names to {@link Pipe} implementations.
+   * Map of {@link PipeMetadata} names to {@link PipeMetadata} implementations.
    */
   config: StringMap<string, PipeBinding> = {};