refactor(render): remove recursion from renderer

The goal is to make implementing a renderer straight forward.

BREAKING_CHANGE:

- Renderer interface was redone / simplified.
- `DirectDomRenderer` was replaced by `DomRenderer`.
- `DirectDomRenderer.setImperativeComponentRootNodes` is replaced
  by the following 2 steps:
    1. `ViewManager.getComponentView(elementRef) -> ViewRef`
    2. `DomRenderer.setComponentViewRootNodes(viewRef, rootNodes)`
- all `@View` annotations need to have a template, but the template
  may be empty. Previously views that had a `renderer` property did
  not have to have a `template`.
- `dynamicComponentLoader.loadIntoNewLocation` does no more allow
  to pass an element, but requires a css selector.
  Special syntax: `:document` can be used as prefix to search globally
  on the document instead of in the provided parent view.

Part of #1675

modules/angular2/src/render/dom/compiler/compiler.js

@@ -2,7 +2,6 @@ import {Injectable} from 'angular2/src/di/annotations_impl';
 
 import {PromiseWrapper, Promise} from 'angular2/src/facade/async';
 import {BaseException, isPresent} from 'angular2/src/facade/lang';
-import {ListWrapper} from 'angular2/src/facade/collection';
 import {DOM} from 'angular2/src/dom/dom_adapter';
 
 import {ViewDefinition, ProtoViewDto, DirectiveMetadata, RenderCompiler, RenderProtoViewRef} from '../../api';
@@ -11,13 +10,6 @@ import {TemplateLoader} from 'angular2/src/render/dom/compiler/template_loader';
 import {CompileStepFactory, DefaultStepFactory} from './compile_step_factory';
 import {Parser} from 'angular2/change_detection';
 import {ShadowDomStrategy} from '../shadow_dom/shadow_dom_strategy';
-import {ProtoViewBuilder} from '../view/proto_view_builder';
-
-import {DirectDomProtoViewRef} from '../direct_dom_renderer';
-
-function _resolveProtoView(protoViewRef:DirectDomProtoViewRef) {
-  return isPresent(protoViewRef) ? protoViewRef.delegate : null;
-}
 
 /**
  * The compiler loads and translates the html templates of components into
@@ -53,18 +45,6 @@ export class DomCompiler extends RenderCompiler {
     return this._compileTemplate(hostViewDef, element);
   }
 
-  createImperativeComponentProtoView(rendererId):Promise<ProtoViewDto> {
-    var protoViewBuilder = new ProtoViewBuilder(null);
-    protoViewBuilder.setImperativeRendererId(rendererId);
-    return PromiseWrapper.resolve(protoViewBuilder.build());
-  }
-
-  mergeChildComponentProtoViews(protoViewRef:RenderProtoViewRef, protoViewRefs:List<RenderProtoViewRef>) {
-    _resolveProtoView(protoViewRef).mergeChildComponentProtoViews(
-      ListWrapper.map(protoViewRefs, _resolveProtoView)
-    );
-  }
-
   _compileTemplate(viewDef: ViewDefinition, tplElement):Promise<ProtoViewDto> {
     var subTaskPromises = [];
     var pipeline = new CompilePipeline(this._stepFactory.createSteps(viewDef, subTaskPromises));