feat(view): add support for instantiation of nested component views.

Include shadowDom creation and integration tests for nested components.

Fix accidentally clobbered modules/core/test/compiler/view_spec.js by
previous commit.

modules/core/src/annotations/directive.js

@@ -15,7 +15,7 @@ export class Directive {
       bind:Object,
       lightDomServices:List,
       implementsTypes:List
-    })
+    }={})
   {
     this.selector = selector;
     this.lightDomServices = lightDomServices;