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/angular2/test/common/directives/ng_if_spec.ts

@@ -14,7 +14,8 @@ import {
 
 import {DOM} from 'angular2/src/core/dom/dom_adapter';
 
-import {Component, View, NgIf} from 'angular2/core';
+import {Component, View} from 'angular2/core';
+import {NgIf} from 'angular2/common';
 
 import {IS_DART} from 'angular2/src/facade/lang';
 

modules/angular2/test/common/directives/observable_list_diff_spec.dart

@@ -2,8 +2,8 @@ library angular2.test.directives.observable_list_iterable_diff_spec;
 
 import 'package:angular2/testing_internal.dart';
 import 'package:observe/observe.dart' show ObservableList;
-import 'package:angular2/core.dart'
-    show ObservableListDiffFactory, ChangeDetectorRef;
+import 'package:angular2/core.dart' show ChangeDetectorRef;
+import 'package:angular2/common.dart' show ObservableListDiffFactory;
 
 @proxy
 class SpyChangeDetectorRef extends SpyObject implements ChangeDetectorRef {

modules/angular2/test/common/forms/directives_spec.ts

@@ -17,6 +17,8 @@ import {
 
 import {SpyNgControl, SpyValueAccessor} from '../spies';
 
+import {QueryList} from 'angular2/core';
+
 import {
   ControlGroup,
   Control,
@@ -32,9 +34,8 @@ import {
   DefaultValueAccessor,
   CheckboxControlValueAccessor,
   SelectControlValueAccessor,
-  QueryList,
   Validator
-} from 'angular2/core';
+} from 'angular2/common';
 
 
 import {selectValueAccessor, composeValidators} from 'angular2/src/common/forms/directives/shared';

modules/angular2/test/common/forms/form_builder_spec.ts

@@ -9,7 +9,7 @@ import {
   afterEach,
   el
 } from 'angular2/testing_internal';
-import {Control, FormBuilder} from 'angular2/core';
+import {Control, FormBuilder} from 'angular2/common';
 import {PromiseWrapper} from 'angular2/src/facade/promise';
 
 export function main() {

modules/angular2/test/common/forms/integration_spec.ts

@@ -19,23 +19,21 @@ import {
 } from 'angular2/testing_internal';
 
 import {DOM} from 'angular2/src/core/dom/dom_adapter';
+import {Input, Provider, forwardRef} from 'angular2/core';
 import {
-  Input,
   Control,
   ControlGroup,
   ControlValueAccessor,
   FORM_DIRECTIVES,
   NG_VALIDATORS,
   NG_ASYNC_VALIDATORS,
-  Provider,
   NgControl,
   NgIf,
   NgFor,
   NgForm,
   Validators,
-  forwardRef,
   Validator
-} from 'angular2/core';
+} from 'angular2/common';
 import {By} from 'angular2/platform/browser';
 import {ListWrapper} from 'angular2/src/facade/collection';
 import {ObservableWrapper} from 'angular2/src/facade/async';

modules/angular2/test/common/forms/model_spec.ts

@@ -13,7 +13,7 @@ import {
   tick,
   inject
 } from 'angular2/testing_internal';
-import {ControlGroup, Control, ControlArray, Validators} from 'angular2/core';
+import {ControlGroup, Control, ControlArray, Validators} from 'angular2/common';
 import {IS_DART, isPresent, CONST_EXPR} from 'angular2/src/facade/lang';
 import {PromiseWrapper} from 'angular2/src/facade/promise';
 import {TimerWrapper, ObservableWrapper, EventEmitter} from 'angular2/src/facade/async';

modules/angular2/test/common/forms/validators_spec.ts

@@ -11,7 +11,7 @@ import {
   tick,
   el
 } from 'angular2/testing_internal';
-import {ControlGroup, Control, Validators, AbstractControl, ControlArray} from 'angular2/core';
+import {ControlGroup, Control, Validators, AbstractControl, ControlArray} from 'angular2/common';
 import {PromiseWrapper} from 'angular2/src/facade/promise';
 import {EventEmitter, ObservableWrapper, TimerWrapper} from 'angular2/src/facade/async';
 import {CONST_EXPR} from 'angular2/src/facade/lang';

modules/angular2/test/common/pipes/async_pipe_spec.ts

@@ -14,7 +14,8 @@ import {
 import {SpyChangeDetectorRef} from '../spies';
 
 import {isBlank} from 'angular2/src/facade/lang';
-import {AsyncPipe, WrappedValue} from 'angular2/core';
+import {AsyncPipe} from 'angular2/common';
+import {WrappedValue} from 'angular2/core';
 import {
   EventEmitter,
   ObservableWrapper,

modules/angular2/test/common/pipes/date_pipe_spec.ts

@@ -10,7 +10,7 @@ import {
   browserDetection
 } from 'angular2/testing_internal';
 
-import {DatePipe} from 'angular2/core';
+import {DatePipe} from 'angular2/common';
 import {DateWrapper} from 'angular2/src/facade/lang';
 import {PipeResolver} from 'angular2/src/core/linker/pipe_resolver';
 

modules/angular2/test/common/pipes/json_pipe_spec.ts

@@ -14,7 +14,8 @@ import {
 } from 'angular2/testing_internal';
 import {Json, RegExp, NumberWrapper, StringWrapper} from 'angular2/src/facade/lang';
 
-import {JsonPipe, Component} from 'angular2/core';
+import {Component} from 'angular2/core';
+import {JsonPipe} from 'angular2/common';
 
 export function main() {
   describe("JsonPipe", () => {

modules/angular2/test/common/pipes/lowercase_pipe_spec.ts

@@ -9,7 +9,7 @@ import {
   afterEach
 } from 'angular2/testing_internal';
 
-import {LowerCasePipe} from 'angular2/core';
+import {LowerCasePipe} from 'angular2/common';
 
 export function main() {
   describe("LowerCasePipe", () => {

modules/angular2/test/common/pipes/number_pipe_spec.ts

@@ -10,7 +10,7 @@ import {
   browserDetection
 } from 'angular2/testing_internal';
 
-import {DecimalPipe, PercentPipe, CurrencyPipe} from 'angular2/core';
+import {DecimalPipe, PercentPipe, CurrencyPipe} from 'angular2/common';
 
 export function main() {
   // TODO(mlaval): enable tests when Intl API is no longer used, see

modules/angular2/test/common/pipes/slice_pipe_spec.ts

@@ -13,7 +13,8 @@ import {
   AsyncTestCompleter
 } from 'angular2/testing_internal';
 
-import {SlicePipe, Component} from 'angular2/core';
+import {Component} from 'angular2/core';
+import {SlicePipe} from 'angular2/common';
 
 export function main() {
   describe("SlicePipe", () => {

modules/angular2/test/common/pipes/uppercase_pipe_spec.ts

@@ -9,7 +9,7 @@ import {
   afterEach
 } from 'angular2/testing_internal';
 
-import {UpperCasePipe} from 'angular2/core';
+import {UpperCasePipe} from 'angular2/common';
 
 export function main() {
   describe("UpperCasePipe", () => {

modules/angular2/test/core/debug/debug_element_spec.ts

@@ -18,7 +18,8 @@ import {DOM} from 'angular2/src/core/dom/dom_adapter';
 
 import {PromiseWrapper, EventEmitter, ObservableWrapper} from 'angular2/src/facade/async';
 
-import {Injectable, NgFor, NgIf} from 'angular2/core';
+import {Injectable} from 'angular2/core';
+import {NgFor, NgIf} from 'angular2/common';
 import {Scope} from 'angular2/core';
 import {By} from 'angular2/platform/browser';
 

modules/angular2/test/core/forward_ref_integration_spec.ts

@@ -18,11 +18,11 @@ import {
   Component,
   Directive,
   Inject,
-  NgFor,
   Query,
   QueryList,
   View
 } from 'angular2/core';
+import {NgFor} from 'angular2/common';
 import {Type} from 'angular2/src/facade/lang';
 import {asNativeElements} from 'angular2/core';
 

modules/angular2/test/core/linker/dynamic_component_loader_spec.ts

@@ -17,7 +17,8 @@ import {
 } from 'angular2/testing_internal';
 
 import {OnDestroy} from 'angular2/lifecycle_hooks';
-import {Injector, NgIf, inspectElement} from 'angular2/core';
+import {Injector, inspectElement} from 'angular2/core';
+import {NgIf} from 'angular2/common';
 import {By} from 'angular2/platform/browser';
 import {Component, View, ViewMetadata} from 'angular2/src/core/metadata';
 import {DynamicComponentLoader} from 'angular2/src/core/linker/dynamic_component_loader';

modules/angular2/test/core/linker/integration_spec.ts

@@ -54,11 +54,11 @@ import {
   Inject,
   Host,
   SkipSelf,
-  SkipSelfMetadata,
-  NgIf,
-  NgFor
+  SkipSelfMetadata
 } from 'angular2/core';
 
+import {NgIf, NgFor} from 'angular2/common';
+
 import {AsyncPipe} from 'angular2/common';
 
 import {

modules/angular2/test/core/linker/query_integration_spec.ts

@@ -19,8 +19,6 @@ import {
   Component,
   Directive,
   Injectable,
-  NgIf,
-  NgFor,
   Optional,
   TemplateRef,
   Query,
@@ -36,7 +34,7 @@ import {
   AfterContentChecked,
   AfterViewChecked
 } from 'angular2/core';
-
+import {NgIf, NgFor} from 'angular2/common';
 import {asNativeElements} from 'angular2/core';
 import {BrowserDomAdapter} from 'angular2/src/platform/browser/browser_adapter';
 

modules/angular2/test/testing/test_component_builder_spec.ts

@@ -14,7 +14,8 @@ import {
   TestComponentBuilder
 } from 'angular2/testing_internal';
 
-import {Injectable, NgIf, provide} from 'angular2/core';
+import {Injectable, provide} from 'angular2/core';
+import {NgIf} from 'angular2/common';
 import {Directive, Component, View, ViewMetadata} from 'angular2/src/core/metadata';
 
 @Component({selector: 'child-comp'})

modules/angular2/test/testing/testing_public_spec.ts

@@ -14,7 +14,8 @@ import {
   TestComponentBuilder
 } from 'angular2/testing';
 
-import {Injectable, NgIf, bind} from 'angular2/core';
+import {Injectable, bind} from 'angular2/core';
+import {NgIf} from 'angular2/common';
 import {Directive, Component, View, ViewMetadata} from 'angular2/angular2';
 import {XHR} from 'angular2/src/compiler/xhr';
 import {XHRImpl} from 'angular2/src/platform/browser/xhr_impl';

modules/angular2/test/web_workers/worker/renderer_integration_spec.ts

@@ -21,9 +21,9 @@ import {
   Component,
   View,
   Injectable,
-  ElementRef,
-  NgIf
+  ElementRef
 } from 'angular2/core';
+import {NgIf} from 'angular2/common';
 import {WebWorkerRenderer} from "angular2/src/web_workers/worker/renderer";
 import {
   ClientMessageBrokerFactory,