cleanup(core): stop reexporting angular2/common from angular2/core

All common directives, forms, and pipes have been moved out of angular2/core,
but we kept reexporting them to make transition easier.

This commit removes the reexports.

BREAKING CHANGE

Before

import {NgIf} from 'angular2/core';

After

import {NgIf} from 'angular2/common';

Closes #5362

modules/benchmarks/src/compiler/compiler_benchmark.ts

@@ -14,7 +14,6 @@ import {
   bind,
   provide,
   Provider,
-  NgIf,
   ViewMetadata
 } from 'angular2/core';
 

modules/benchmarks/src/costs/index.ts

@@ -1,13 +1,6 @@
 import {bootstrap} from 'angular2/bootstrap';
-import {
-  Component,
-  Directive,
-  DynamicComponentLoader,
-  ElementRef,
-  View,
-  NgIf,
-  NgFor
-} from 'angular2/core';
+import {Component, Directive, DynamicComponentLoader, ElementRef, View} from 'angular2/core';
+import {NgIf, NgFor} from 'angular2/common';
 import {ApplicationRef} from 'angular2/src/core/application_ref';
 import {ListWrapper} from 'angular2/src/facade/collection';
 import {getIntParameter, bindAction} from 'angular2/src/testing/benchmark_util';

modules/benchmarks/src/largetable/largetable_benchmark.ts

@@ -8,17 +8,8 @@ import {
   windowProfileEnd
 } from 'angular2/src/testing/benchmark_util';
 import {bootstrap} from 'angular2/bootstrap';
-import {
-  Component,
-  Directive,
-  View,
-  bind,
-  provide,
-  NgFor,
-  NgSwitch,
-  NgSwitchWhen,
-  NgSwitchDefault
-} from 'angular2/core';
+import {Component, Directive, View, bind, provide} from 'angular2/core';
+import {NgFor, NgSwitch, NgSwitchWhen, NgSwitchDefault} from 'angular2/common';
 import {ApplicationRef} from 'angular2/src/core/application_ref';
 import {BrowserDomAdapter} from 'angular2/src/platform/browser/browser_adapter';
 import {APP_VIEW_POOL_CAPACITY} from 'angular2/src/core/linker/view_pool';

modules/benchmarks/src/naive_infinite_scroll/app.ts

@@ -2,7 +2,7 @@ import {isPresent} from 'angular2/src/facade/lang';
 import {getIntParameter, bindAction} from 'angular2/src/testing/benchmark_util';
 import {TimerWrapper} from 'angular2/src/facade/async';
 import {ScrollAreaComponent} from './scroll_area';
-import {NgIf, NgFor} from 'angular2/core';
+import {NgIf, NgFor} from 'angular2/common';
 import {DOM} from 'angular2/src/core/dom/dom_adapter';
 import {document} from 'angular2/src/facade/browser';
 

modules/benchmarks/src/naive_infinite_scroll/cells.ts

@@ -1,6 +1,6 @@
 import {ListWrapper, Map} from 'angular2/src/facade/collection';
 import {Company, Opportunity, Offering, Account, CustomDate, STATUS_LIST} from './common';
-import {NgFor} from 'angular2/core';
+import {NgFor} from 'angular2/common';
 
 import {Component, Directive, View} from 'angular2/angular2';
 

modules/benchmarks/src/naive_infinite_scroll/scroll_area.ts

@@ -14,7 +14,7 @@ import {
 } from './common';
 import {generateOfferings} from './random_data';
 import {ScrollItemComponent} from './scroll_item';
-import {NgFor} from 'angular2/core';
+import {NgFor} from 'angular2/common';
 
 @Component({
   selector: 'scroll-area',

modules/benchmarks/src/static_tree/tree_benchmark.ts

@@ -1,4 +1,5 @@
 import {bootstrap} from 'angular2/bootstrap';
+import {NgIf} from 'angular2/common';
 import {
   Compiler,
   Component,
@@ -7,8 +8,7 @@ import {
   ViewContainerRef,
   bind,
   provide,
-  Provider,
-  NgIf
+  Provider
 } from 'angular2/core';
 import {ComponentRef_} from 'angular2/src/core/linker/dynamic_component_loader';
 import {ApplicationRef} from 'angular2/src/core/application_ref';

modules/benchmarks/src/tree/tree_benchmark.ts

@@ -7,9 +7,9 @@ import {
   ViewContainerRef,
   bind,
   provide,
-  Provider,
-  NgIf
+  Provider
 } from 'angular2/core';
+import {NgIf} from 'angular2/common';
 
 import {ApplicationRef} from 'angular2/src/core/application_ref';
 import {DOM} from 'angular2/src/core/dom/dom_adapter';