cleanup(pipes): clean up imports

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

@@ -1,15 +1,9 @@
-import {
-  isBlank,
-  isString,
-  isArray,
-  StringWrapper,
-  CONST
-} from 'angular2/src/core/facade/lang';
+import {isBlank, isString, isArray, StringWrapper, CONST} from 'angular2/src/core/facade/lang';
 import {BaseException} from 'angular2/src/core/facade/exceptions';
 import {ListWrapper} from 'angular2/src/core/facade/collection';
-import {Injectable} from 'angular2/di';
+import {Injectable} from 'angular2/src/core/di';
 
-import {PipeTransform, WrappedValue} from 'angular2/change_detection';
+import {PipeTransform, WrappedValue} from 'angular2/src/core/change_detection';
 import {InvalidPipeArgumentException} from './invalid_pipe_argument_exception';
 
 import {Pipe} from '../metadata';

modules/angular2/test/pipes/slice_pipe_spec.ts

@@ -1,6 +1,6 @@
 import {ddescribe, describe, it, iit, xit, expect, beforeEach, afterEach} from 'angular2/test_lib';
 
-import {SlicePipe} from 'angular2/pipes';
+import {SlicePipe} from 'angular2/src/core/pipes';
 
 export function main() {
   describe("SlicePipe", () => {

modules/angular2/test/public_api_spec.ts

@@ -464,9 +464,9 @@ const NG_API = [
   'LifeCycle.registerWith',
   'LifeCycle.tick',
 
-  'LimitToPipe',
-  'LimitToPipe.supports',
-  'LimitToPipe.transform',
+  'SlicePipe',
+  'SlicePipe.supports',
+  'SlicePipe.transform',
 
   'Locals',
   'Locals.clearValues',