refactor: export core APIs from angular2/core

This change moves many APIs to the angular2/core export.

This change also automatically adds FORM_BINDINGS in
the application root injector.

BREAKING CHANGE:
    Many dependencies that were previously exported from specific
    APIs are now exported from angular2/core. Affected exports, which
    should now be included from angular2/core include:

    angular2/forms
    angular2/di
    angular2/directives
    angular2/change_detection
    angular2/bootstrap (except for dart users)
    angular2/render
    angular2/metadata
    angular2/debug
    angular2/pipes
Closes #3977

modules/angular2/src/core/pipes/async_pipe.ts

@@ -1,13 +1,15 @@
 import {isBlank, isPresent, isPromise, CONST, BaseException} from 'angular2/src/core/facade/lang';
-import {Observable, Promise, ObservableWrapper} from 'angular2/src/core/facade/async';
-import {Injectable} from 'angular2/di';
+import {Promise, ObservableWrapper, Observable} from 'angular2/src/core/facade/async';
+import {Pipe} from 'angular2/src/core/metadata';
+import {Injectable} from 'angular2/src/core/di';
+import {
+  ChangeDetectorRef,
+  PipeOnDestroy,
+  PipeTransform,
+  WrappedValue
+} from 'angular2/src/core/change_detection';
 
-import {PipeTransform, PipeOnDestroy, WrappedValue} from 'angular2/change_detection';
 import {InvalidPipeArgumentException} from './invalid_pipe_argument_exception';
-import {ChangeDetectorRef} from 'angular2/change_detection';
-
-import {Pipe} from '../metadata';
-
 
 class ObservableStrategy {
   createSubscription(async: any, updateLatestValue: any): any {

modules/angular2/src/core/pipes/date_pipe.ts

@@ -9,13 +9,13 @@ import {
   FunctionWrapper
 } from 'angular2/src/core/facade/lang';
 import {DateFormatter} from 'angular2/src/core/facade/intl';
-import {Injectable} from 'angular2/di';
+import {Injectable} from 'angular2/src/core/di';
+import {Pipe} from 'angular2/src/core/metadata';
+import {PipeTransform, WrappedValue} from 'angular2/src/core/change_detection';
 import {StringMapWrapper, ListWrapper} from 'angular2/src/core/facade/collection';
 
-import {PipeTransform, WrappedValue} from 'angular2/change_detection';
 import {InvalidPipeArgumentException} from './invalid_pipe_argument_exception';
 
-import {Pipe} from '../metadata';
 
 // TODO: move to a global configable location along with other i18n components.
 var defaultLocale: string = 'en-US';

modules/angular2/src/core/pipes/default_pipes.ts

@@ -7,7 +7,7 @@ import {DatePipe} from './date_pipe';
 import {DecimalPipe, PercentPipe, CurrencyPipe} from './number_pipe';
 
 import {CONST_EXPR} from 'angular2/src/core/facade/lang';
-import {Binding, OpaqueToken} from 'angular2/di';
+import {Binding, OpaqueToken} from 'angular2/src/core/di';
 
 const DEFAULT_PIPES_LIST = CONST_EXPR([
   AsyncPipe,
@@ -21,7 +21,7 @@ const DEFAULT_PIPES_LIST = CONST_EXPR([
   DatePipe
 ]);
 
-export const DEFAULT_PIPES_TOKEN = CONST_EXPR(new OpaqueToken("Default Pipes"));
+export const DEFAULT_PIPES_TOKEN: OpaqueToken = CONST_EXPR(new OpaqueToken("Default Pipes"));
 
-export const DEFAULT_PIPES =
+export const DEFAULT_PIPES: Binding =
     CONST_EXPR(new Binding(DEFAULT_PIPES_TOKEN, {toValue: DEFAULT_PIPES_LIST}));

modules/angular2/src/core/pipes/json_pipe.ts

@@ -1,9 +1,7 @@
 import {isBlank, isPresent, Json, CONST} from 'angular2/src/core/facade/lang';
-import {Injectable} from 'angular2/di';
-
-import {PipeTransform, WrappedValue} from 'angular2/change_detection';
-
-import {Pipe} from '../metadata';
+import {Injectable} from 'angular2/src/core/di';
+import {PipeTransform, WrappedValue} from 'angular2/src/core/change_detection';
+import {Pipe} from 'angular2/src/core/metadata';
 
 /**
  * Implements json transforms to any object.

modules/angular2/src/core/pipes/limit_to_pipe.ts

@@ -8,13 +8,11 @@ import {
 } from 'angular2/src/core/facade/lang';
 import {ListWrapper} from 'angular2/src/core/facade/collection';
 import {Math} from 'angular2/src/core/facade/math';
-import {Injectable} from 'angular2/di';
-
-import {PipeTransform, WrappedValue} from 'angular2/change_detection';
+import {PipeTransform, WrappedValue} from 'angular2/src/core/change_detection';
+import {Injectable} from 'angular2/src/core/di';
+import {Pipe} from 'angular2/src/core/metadata';
 import {InvalidPipeArgumentException} from './invalid_pipe_argument_exception';
 
-import {Pipe} from '../metadata';
-
 /**
  * Creates a new Array or String containing only a prefix/suffix of the
  * elements.

modules/angular2/src/core/pipes/lowercase_pipe.ts

@@ -1,12 +1,10 @@
 import {isString, StringWrapper, CONST, isBlank} from 'angular2/src/core/facade/lang';
-import {Injectable} from 'angular2/di';
+import {Injectable} from 'angular2/src/core/di';
+import {PipeTransform, WrappedValue} from 'angular2/src/core/change_detection';
+import {Pipe} from 'angular2/src/core/metadata';
 
-import {PipeTransform, WrappedValue} from 'angular2/change_detection';
 import {InvalidPipeArgumentException} from './invalid_pipe_argument_exception';
 
-
-import {Pipe} from '../metadata';
-
 /**
  * Implements lowercase transforms to text.
  *

modules/angular2/src/core/pipes/number_pipe.ts

@@ -10,14 +10,13 @@ import {
   FunctionWrapper
 } from 'angular2/src/core/facade/lang';
 import {NumberFormatter, NumberFormatStyle} from 'angular2/src/core/facade/intl';
-import {Injectable} from 'angular2/di';
+import {Injectable} from 'angular2/src/core/di';
+import {PipeTransform, WrappedValue} from 'angular2/src/core/change_detection';
+import {Pipe} from 'angular2/src/core/metadata';
 import {ListWrapper} from 'angular2/src/core/facade/collection';
 
-import {PipeTransform, WrappedValue} from 'angular2/change_detection';
 import {InvalidPipeArgumentException} from './invalid_pipe_argument_exception';
 
-import {Pipe} from '../metadata';
-
 var defaultLocale: string = 'en-US';
 var _re = RegExpWrapper.create('^(\\d+)?\\.((\\d+)(\\-(\\d+))?)?$');
 

modules/angular2/src/core/pipes/pipe_binding.ts

@@ -1,6 +1,6 @@
 import {Type} from 'angular2/src/core/facade/lang';
-import {Key, ResolvedBinding, Binding} from 'angular2/di';
 import {ResolvedFactory, resolveBinding} from 'angular2/src/core/di/binding';
+import {Key, ResolvedBinding, Binding} from 'angular2/src/core/di';
 import {PipeMetadata} from '../metadata/directives';
 
 export class PipeBinding extends ResolvedBinding {

modules/angular2/src/core/pipes/pipes.ts

@@ -1,5 +1,12 @@
 import {isBlank, isPresent, BaseException, CONST, Type} from 'angular2/src/core/facade/lang';
-import {Injectable, OptionalMetadata, SkipSelfMetadata, Binding, Injector, bind} from 'angular2/di';
+import {
+  Injectable,
+  OptionalMetadata,
+  SkipSelfMetadata,
+  Binding,
+  Injector,
+  bind
+} from 'angular2/src/core/di';
 import {PipeBinding} from './pipe_binding';
 import * as cd from 'angular2/src/core/change_detection/pipes';
 

modules/angular2/src/core/pipes/uppercase_pipe.ts

@@ -1,11 +1,9 @@
 import {isString, StringWrapper, CONST, isBlank} from 'angular2/src/core/facade/lang';
-import {Injectable} from 'angular2/di';
-
-import {PipeTransform, WrappedValue} from 'angular2/change_detection';
+import {Pipe} from 'angular2/src/core/metadata';
+import {Injectable} from 'angular2/src/core/di';
+import {PipeTransform, WrappedValue} from 'angular2/src/core/change_detection';
 import {InvalidPipeArgumentException} from './invalid_pipe_argument_exception';
 
-import {Pipe} from '../metadata';
-
 /**
  * Implements uppercase transforms to text.
  *