cleanup(change_detection): rename field name

Author: vsavkin

modules/angular2/src/change_detection/abstract_change_detector.js

@@ -5,11 +5,11 @@ import {ChangeDetector, CHECK_ALWAYS, CHECK_ONCE, CHECKED, DETACHED} from './int
 export class AbstractChangeDetector extends ChangeDetector {
  children:List;
  parent:ChangeDetector;
- status:string;
+ mode:string;
 
  constructor() {
  this.children = [];
- this.status = CHECK_ALWAYS;
+ this.mode = CHECK_ALWAYS;
  }
 
  addChild(cd:ChangeDetector) {