feat(di): removed app injector

BREAKING CHANGE:

THe appInjector property has been removed. Instead use viewInjector or hostInjector.

modules/angular2/src/core/application.ts

@@ -209,11 +209,9 @@ function _createNgZone(givenReporter: Function): NgZone {
  *  1. It uses the component's `selector` property to locate the DOM element which needs to be
  * upgraded into
  *     the angular component.
- *  2. It creates a new child injector (from the platform injector) and configures the injector with
- * the component's
- *     `appInjector`. Optionally, you can also override the injector configuration for an app by
- * invoking
- *     `bootstrap` with the `componentInjectableBindings` argument.
+ *  2. It creates a new child injector (from the platform injector). Optionally, you can also
+ * override the injector configuration for an app by
+ * invoking `bootstrap` with the `componentInjectableBindings` argument.
  *  3. It creates a new `Zone` and connects it to the angular application's change detection domain
  * instance.
  *  4. It creates a shadow DOM on the selected component's host element and loads the template into
@@ -270,9 +268,9 @@ function _createNgZone(givenReporter: Function): NgZone {
  * - `appComponentType`: The root component which should act as the application. This is a reference
  * to a `Type`
  *   which is annotated with `@Component(...)`.
- * - `componentInjectableBindings`: An additional set of bindings that can be added to `appInjector`
- * for the
- * {@link Component} to override default injection behavior.
+ * - `componentInjectableBindings`: An additional set of bindings that can be added to the app
+ * injector
+ * to override default injection behavior.
  * - `errorReporter`: `function(exception:any, stackTrace:string)` a default error reporter for
  * unhandled exceptions.
  *