refactor(views): split ViewManager/ViewContainerRef.createView into 2 methods

BREAKING CHANGES:

`ViewManager.createView` / `ViewContainerRef.create` have been split into 2 methods:

- `createHostView` which takes dynamically created bindings
- `createEmbeddedView` which takes the newly introduced `TemplateRef`

The new type `TemplateRef` is the combination of a `ProtoViewRef` and and `ElementRef`
from the same place. Use `TemplateRef` when working with embedded views in
`ng-if`, `ng-for`, ... instead of `ProtoViewRef`.

Also, `ProtoViewRef` is no more injectable, but `TemplateRef` is.

First part of #1989 to clean up manual content projection.
Closes #3114

modules/angular2/core.ts

@@ -18,6 +18,7 @@ export {AppViewManager} from 'angular2/src/core/compiler/view_manager';
 export {IQueryList} from 'angular2/src/core/compiler/interface_query';
 export {QueryList} from 'angular2/src/core/compiler/query_list';
 export {ElementRef} from 'angular2/src/core/compiler/element_ref';
+export {TemplateRef} from 'angular2/src/core/compiler/template_ref';
 export {RenderElementRef} from 'angular2/src/render/api';
 export {ViewRef, ProtoViewRef} from 'angular2/src/core/compiler/view_ref';
 export {ViewContainerRef} from 'angular2/src/core/compiler/view_container_ref';