fix(ZoneOperators): Remove hard dependency on Angular 2

lib/operator/enterZone.ts

@@ -1,26 +1,25 @@
-import { NgZone } from '@angular/core';
 import { Operator } from 'rxjs/Operator';
 import { Subscriber } from 'rxjs/Subscriber';
 import { Observable } from 'rxjs/Observable';
 
 export interface EnterZoneSignature<T> {
-  (zone: NgZone): Observable<T>;
+  (zone: { run: (fn: any) => any }): Observable<T>;
 }
 
-export function enterZone<T>(zone: NgZone): Observable<T> {
+export function enterZone<T>(zone: { run: (fn: any) => any }): Observable<T> {
   return this.lift(new EnterZoneOperator(zone));
 }
 
 export class EnterZoneOperator<T> implements Operator<T, T> {
-  constructor(private _zone: NgZone) { }
+  constructor(private _zone: { run: (fn: any) => any }) { }
 
   call(subscriber: Subscriber<T>, source: any): any {
     return source._subscribe(new EnterZoneSubscriber(subscriber, this._zone));
   }
 }
 
 class EnterZoneSubscriber<T> extends Subscriber<T> {
-  constructor(destination: Subscriber<T>, private _zone: NgZone) {
+  constructor(destination: Subscriber<T>, private _zone: { run: (fn: any) => any }) {
     super(destination);
   }
 

lib/operator/leaveZone.ts

@@ -1,26 +1,25 @@
-import { NgZone } from '@angular/core';
 import { Operator } from 'rxjs/Operator';
 import { Subscriber } from 'rxjs/Subscriber';
 import { Observable } from 'rxjs/Observable';
 
-export function leaveZone<T>(zone: NgZone): Observable<T> {
+export function leaveZone<T>(zone: { runOutsideAngular: (fn: any) => any }): Observable<T> {
   return this.lift(new LeaveZoneOperator(zone));
 }
 
 export interface LeaveZoneSignature<T> {
-  (zone: NgZone): Observable<T>;
+  (zone: { runOutsideAngular: (fn: any) => any }): Observable<T>;
 }
 
 export class LeaveZoneOperator<T> implements Operator<T, T> {
-  constructor(private _zone: NgZone) { }
+  constructor(private _zone: { runOutsideAngular: (fn: any) => any }) { }
 
   call(subscriber: Subscriber<T>, source: any): any {
     return source._subscribe(new LeaveZoneSubscriber(subscriber, this._zone));
   }
 }
 
 class LeaveZoneSubscriber<T> extends Subscriber<T> {
-  constructor(destination: Subscriber<T>, private _zone: NgZone) {
+  constructor(destination: Subscriber<T>, private _zone: { runOutsideAngular: (fn: any) => any }) {
     super(destination);
   }
 

package.json

@@ -37,8 +37,7 @@
   ],
   "license": "MIT",
   "peerDependencies": {
-    "rxjs": "5.0.0-beta.6",
-    "@angular/core": "^2.0.0-rc.1"
+    "rxjs": "5.0.0-beta.6"
   },
   "devDependencies": {
     "@angular/common": "^2.0.0-rc.1",