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/forms/directives/checkbox_value_accessor.ts

@@ -1,5 +1,5 @@
 import {Renderer} from 'angular2/render';
-import {Directive} from 'angular2/annotations';
+import {Directive} from 'angular2/metadata';
 import {ElementRef} from 'angular2/core';
 import {Self} from 'angular2/di';
 

modules/angular2/src/forms/directives/default_value_accessor.ts

@@ -1,5 +1,5 @@
 import {Renderer} from 'angular2/render';
-import {Directive} from 'angular2/annotations';
+import {Directive} from 'angular2/metadata';
 import {ElementRef} from 'angular2/core';
 import {Self} from 'angular2/di';
 import {NgControl} from './ng_control';

modules/angular2/src/forms/directives/ng_control_group.ts

@@ -1,4 +1,4 @@
-import {Directive, LifecycleEvent} from 'angular2/annotations';
+import {Directive, LifecycleEvent} from 'angular2/metadata';
 import {Inject, Host, SkipSelf, forwardRef, Binding} from 'angular2/di';
 import {List, ListWrapper} from 'angular2/src/facade/collection';
 import {CONST_EXPR} from 'angular2/src/facade/lang';

modules/angular2/src/forms/directives/ng_control_name.ts

@@ -3,7 +3,7 @@ import {EventEmitter, ObservableWrapper} from 'angular2/src/facade/async';
 import {List, StringMap} from 'angular2/src/facade/collection';
 
 import {QueryList} from 'angular2/core';
-import {Query, Directive, LifecycleEvent} from 'angular2/annotations';
+import {Query, Directive, LifecycleEvent} from 'angular2/metadata';
 import {forwardRef, Host, SkipSelf, Binding, Inject} from 'angular2/di';
 
 import {ControlContainer} from './control_container';

modules/angular2/src/forms/directives/ng_form.ts

@@ -6,7 +6,7 @@ import {
 } from 'angular2/src/facade/async';
 import {StringMapWrapper, List, ListWrapper} from 'angular2/src/facade/collection';
 import {isPresent, isBlank, CONST_EXPR} from 'angular2/src/facade/lang';
-import {Directive} from 'angular2/annotations';
+import {Directive} from 'angular2/metadata';
 import {forwardRef, Binding} from 'angular2/di';
 import {NgControl} from './ng_control';
 import {Form} from './form_interface';

modules/angular2/src/forms/directives/ng_form_control.ts

@@ -2,7 +2,7 @@ import {CONST_EXPR} from 'angular2/src/facade/lang';
 import {EventEmitter, ObservableWrapper} from 'angular2/src/facade/async';
 
 import {QueryList} from 'angular2/core';
-import {Query, Directive, LifecycleEvent} from 'angular2/annotations';
+import {Query, Directive, LifecycleEvent} from 'angular2/metadata';
 import {forwardRef, Binding} from 'angular2/di';
 
 import {NgControl} from './ng_control';

modules/angular2/src/forms/directives/ng_form_model.ts

@@ -2,7 +2,7 @@ import {CONST_EXPR} from 'angular2/src/facade/lang';
 import {List, ListWrapper} from 'angular2/src/facade/collection';
 import {ObservableWrapper, EventEmitter} from 'angular2/src/facade/async';
 
-import {Directive, LifecycleEvent} from 'angular2/annotations';
+import {Directive, LifecycleEvent} from 'angular2/metadata';
 import {forwardRef, Binding} from 'angular2/di';
 import {NgControl} from './ng_control';
 import {NgControlGroup} from './ng_control_group';

modules/angular2/src/forms/directives/ng_model.ts

@@ -2,7 +2,7 @@ import {CONST_EXPR} from 'angular2/src/facade/lang';
 import {EventEmitter, ObservableWrapper} from 'angular2/src/facade/async';
 
 import {QueryList} from 'angular2/core';
-import {Query, Directive, LifecycleEvent} from 'angular2/annotations';
+import {Query, Directive, LifecycleEvent} from 'angular2/metadata';
 import {forwardRef, Binding} from 'angular2/di';
 
 import {NgControl} from './ng_control';

modules/angular2/src/forms/directives/select_control_value_accessor.ts

@@ -1,7 +1,7 @@
 import {Renderer} from 'angular2/render';
 import {ElementRef, QueryList} from 'angular2/core';
 import {Self} from 'angular2/di';
-import {Query, Directive} from 'angular2/annotations';
+import {Query, Directive} from 'angular2/metadata';
 
 import {NgControl} from './ng_control';
 import {ControlValueAccessor} from './control_value_accessor';

modules/angular2/src/forms/directives/validators.ts

@@ -1,6 +1,6 @@
 import {forwardRef, Binding} from 'angular2/di';
 import {CONST_EXPR} from 'angular2/src/facade/lang';
-import {Directive} from 'angular2/annotations';
+import {Directive} from 'angular2/metadata';
 import {Validators} from '../validators';
 
 export class NgValidator {