fix(babel): fix an issue where babel could not compile `Scheduler.async` (#1807)
fix(babel): fix an issue where babel could not compile `Scheduler.async` (#1807)

This moves the `async` property to be the last one defined, because babel will then not choke on the `,` after the property.

fixes #1806
Brocco/RxJS,IgorMinar/RxJS,figueredo/RxJS,elliotschi/rxjs,trxcllnt/RxJS,Brocco/RxJS,adrianomelo/RxJSNext,SangKa/RxJS-Docs-CN,robwormald/RxJS,RxJS-CN/RxJS-Docs-CN,figueredo/RxJS,ReactiveX/RxJS,benlesh/RxJS,jayphelps/rxjs,ReactiveX/rxjs,gluck/RxJS,saneyuki/RxJS,kwonoj/RxJS,benlesh/RxJS,adrianomelo/RxJS-1,figueredo/RxJS,RxJS-CN/RxJS-Docs-CN,Brocco/RxJS,ReactiveX/RxJS,jayphelps/rxjs,trxcllnt/RxJS,jayphelps/rxjs,trxcllnt/RxJS,gluck/RxJS,SangKa/RxJS-Docs-CN,adrianomelo/RxJS-1,adrianomelo/RxJSNext,martinsik/rxjs,staltz/RxJSNext,saneyuki/RxJS,adrianomelo/RxJSNext,jayphelps/rxjs,gluck/RxJS,SangKa/RxJS-Docs-CN,elliotschi/rxjs,staltz/RxJSNext,robwormald/RxJS,kwonoj/RxJS,martinsik/rxjs,robwormald/RxJS,jayphelps/rxjs,adrianomelo/RxJS-1,staltz/RxJSNext,robwormald/RxJS,martinsik/rxjs,ReactiveX/rxjs,Brocco/RxJS,ReactiveX/rxjs,figueredo/RxJS,SangKa/RxJS-Docs-CN,staltz/RxJSNext,RxJS-CN/RxJS-Docs-CN,martinsik/rxjs,trxcllnt/RxJS,RxJS-CN/RxJS-Docs-CN,ReactiveX/RxJS,elliotschi/rxjs,kwonoj/RxJS,elliotschi/rxjs,ReactiveX/rxjs,ReactiveX/RxJS,benlesh/RxJS,adrianomelo/RxJSNext,gluck/RxJS,adrianomelo/RxJS-1,kwonoj/RxJS,IgorMinar/RxJS,benlesh/RxJS