refactor(examples): remove imports from 'angular2/angular2'

Closes #5803

modules/angular2/examples/core/pipes/ts/async_pipe/async_pipe_example.ts

@@ -1,4 +1,4 @@
-import {Component, provide, Observable} from 'angular2/angular2';
+import {Component, provide, Observable} from 'angular2/core';
 import {bootstrap} from 'angular2/bootstrap';
 
 // #docregion AsyncPipe

modules/angular2/examples/core/pipes/ts/date_pipe/date_pipe_example.ts

@@ -1,4 +1,4 @@
-import {Component, provide} from 'angular2/angular2';
+import {Component, provide} from 'angular2/core';
 import {bootstrap} from 'angular2/bootstrap';
 
 // #docregion DatePipe

modules/angular2/examples/core/pipes/ts/json_pipe/json_pipe_example.ts

@@ -1,4 +1,4 @@
-import {Component, provide} from 'angular2/angular2';
+import {Component, provide} from 'angular2/core';
 import {bootstrap} from 'angular2/bootstrap';
 
 // #docregion JsonPipe

modules/angular2/examples/core/pipes/ts/lowerupper_pipe/lowerupper_pipe_example.ts

@@ -1,4 +1,4 @@
-import {Component, provide} from 'angular2/angular2';
+import {Component, provide} from 'angular2/core';
 import {bootstrap} from 'angular2/bootstrap';
 
 // #docregion LowerUpperPipe

modules/angular2/examples/core/pipes/ts/number_pipe/number_pipe_example.ts

@@ -1,4 +1,4 @@
-import {Component, provide} from 'angular2/angular2';
+import {Component, provide} from 'angular2/core';
 import {bootstrap} from 'angular2/bootstrap';
 
 // #docregion NumberPipe

modules/angular2/examples/core/pipes/ts/slice_pipe/slice_pipe_example.ts

@@ -1,4 +1,4 @@
-import {Component, provide} from 'angular2/angular2';
+import {Component, provide} from 'angular2/core';
 import {bootstrap} from 'angular2/bootstrap';
 
 // #docregion SlicePipe_string

modules/angular2/examples/core/ts/dev_mode/dev_mode_example.ts

@@ -1,5 +1,6 @@
 // #docregion enableDevMode
-import {bootstrap, enableDevMode} from 'angular2/angular2';
+import {enableDevMode} from 'angular2/core';
+import {bootstrap} from 'angular2/bootstrap';
 import {MyComponent} from 'my_component';
 
 enableDevMode();

modules/angular2/examples/router/ts/can_activate/can_activate_example.ts

@@ -1,4 +1,5 @@
-import {bootstrap, provide, Component} from 'angular2/angular2';
+import {provide, Component} from 'angular2/core';
+import {bootstrap} from 'angular2/bootstrap';
 import {
   CanActivate,
   RouteConfig,

modules/angular2/examples/router/ts/can_deactivate/can_deactivate_example.ts

@@ -1,4 +1,5 @@
-import {provide, bootstrap, Component} from 'angular2/angular2';
+import {provide, Component} from 'angular2/core';
+import {bootstrap} from 'angular2/bootstrap';
 import {
   CanDeactivate,
   RouteConfig,

modules/angular2/examples/router/ts/on_activate/on_activate_example.ts

@@ -1,4 +1,5 @@
-import {Component, provide, bootstrap} from 'angular2/angular2';
+import {Component, provide} from 'angular2/core';
+import {bootstrap} from 'angular2/bootstrap';
 import {
   OnActivate,
   ComponentInstruction,

modules/angular2/examples/router/ts/on_deactivate/on_deactivate_example.ts

@@ -1,4 +1,5 @@
-import {Component, Injectable, NgFor, provide, bootstrap} from 'angular2/angular2';
+import {Component, Injectable, provide} from 'angular2/core';
+import {bootstrap} from 'angular2/bootstrap';
 import {
   OnDeactivate,
   ComponentInstruction,
@@ -43,7 +44,7 @@ class MyCmp implements OnDeactivate {
       <p *ngFor="#logItem of logService.logs">{{ logItem }}</p>
     </div>
   `,
-  directives: [ROUTER_DIRECTIVES, NgFor]
+  directives: [ROUTER_DIRECTIVES]
 })
 @RouteConfig([
   {path: '/', component: MyCmp, name: 'HomeCmp'},

modules/angular2/examples/router/ts/reuse/reuse_example.ts

@@ -1,4 +1,5 @@
-import {bootstrap, Component, provide} from 'angular2/angular2';
+import {Component, provide} from 'angular2/core';
+import {bootstrap} from 'angular2/bootstrap';
 import {
   CanActivate,
   RouteConfig,