fix(analyzer): fix dart analyzer errors

modules/angular2/src/core/facade/exceptions.dart

@@ -30,3 +30,7 @@ class WrappedException extends Error {
 Error makeTypeError([String message = ""]) {
   return new BaseException(message);
 }
+
+dynamic unimplemented() {
+  throw new BaseException('unimplemented');
+}

modules/angular2/src/core/linker/element_ref.ts

@@ -66,5 +66,8 @@ export class ElementRef_ extends ElementRef {
   }
 
   get renderView(): RenderViewRef { return (<ViewRef_>this.parentView).render; }
+  set renderView(value) {
+    unimplemented();
+  }
   get nativeElement(): any { return this._renderer.getNativeElementSync(this); }
 }

modules/angular2/test/core/linker/integration_spec.ts

@@ -90,7 +90,6 @@ import {TemplateRef} from 'angular2/src/core/linker/template_ref';
 
 import {DomRenderer} from 'angular2/src/core/render/dom/dom_renderer';
 import {IS_DART} from '../../platform';
-import {Compiler_} from "angular2/src/core/linker/compiler";
 
 const ANCHOR_ELEMENT = CONST_EXPR(new OpaqueToken('AnchorElement'));