refactor(core): renamed injectables into appInjector

BREAKING CHANGES

Before:

@Component({injectables: [Type]} class MyCmp{}

After:

@Component({appInjector: [Type]} class MyCmp{}

modules/examples/src/material/dialog/index.js

@@ -13,7 +13,7 @@ import {View} from 'angular2/src/core/annotations_impl/view';
 
 @Component({
   selector: 'demo-app',
-  injectables: [MdDialog]
+  appInjector: [MdDialog]
 })
 @View({
   templateUrl: './demo_app.html',

modules/examples/src/material/radio/index.js

@@ -12,7 +12,7 @@ import {View} from 'angular2/src/core/annotations_impl/view';
 
 @Component({
   selector: 'demo-app',
-  injectables: [MdRadioDispatcher]
+  appInjector: [MdRadioDispatcher]
 })
 @View({
   templateUrl: './demo_app.html',