feat(reorganize): export schedulers from rxjs

- Exports schedulers as `asapScheduler`, `asyncScheduler`, `queueScheduler` and `animationFrameScheduler`

BREAKING CHANGE: Scheduler instances have changed names to be suffixed with `Scheduler`, (e.g. `asap` -> `asapScheduler`)

spec/index-spec.ts

@@ -132,4 +132,11 @@ describe('index', () => {
     expect(index.BehaviorSubject).to.exist;
     expect(index.ReplaySubject).to.exist;
   });
+
+  it('should export the schedulers', () => {
+    expect(index.asapScheduler).to.exist;
+    expect(index.asyncScheduler).to.exist;
+    expect(index.queueScheduler).to.exist;
+    expect(index.animationFrameScheduler).to.exist;
+  });
 });

src/index.ts

@@ -132,3 +132,10 @@ export { zipAll } from './operators/zipAll';
 export { Subject } from './Subject';
 export { BehaviorSubject } from './BehaviorSubject';
 export { ReplaySubject } from './ReplaySubject';
+
+/* Schedulers */
+
+export { asap as asapScheduler } from './scheduler/asap';
+export { async as asyncScheduler } from './scheduler/async';
+export { queue as queueScheduler } from './scheduler/queue';
+export { animationFrame as animationFrameScheduler } from './scheduler/animationFrame';