test(windowTime): add marble tests for windowTime
test(windowTime): add marble tests for windowTime

Add tests that mirror RxJS legacy's tests.

jayphelps/rxjs,trxcllnt/RxJS,staltz/RxJSNext,ReactiveX/rxjs,ReactiveX/RxJS,gluck/RxJS,trxcllnt/RxJS,robwormald/RxJS,robwormald/RxJS,figueredo/RxJS,ReactiveX/RxJS,SangKa/RxJS-Docs-CN,ReactiveX/RxJS,Brocco/RxJS,gluck/RxJS,jinroh/RxJS,jayphelps/rxjs,trxcllnt/RxJS,justinwoo/RxJS,jinroh/RxJS,Igorbek/rxjs5,staltz/RxJSNext,benlesh/RxJS,jinroh/RxJS,Brocco/RxJS,Igorbek/rxjs5,justinwoo/RxJS,kwonoj/RxJS,RxJS-CN/RxJS-Docs-CN,jadbox/RxJS,trxcllnt/RxJS,gluck/RxJS,elliotschi/rxjs,mattpodwysocki/RxJS,mattpodwysocki/RxJS,jadbox/RxJS,Igorbek/rxjs5,mattpodwysocki/RxJS,Igorbek/rxjs5,SangKa/RxJS-Docs-CN,RxJS-CN/RxJS-Docs-CN,figueredo/RxJS,robwormald/RxJS,adrianomelo/RxJSNext,jayphelps/rxjs,staltz/RxJSNext,elliotschi/rxjs,jayphelps/rxjs,IgorMinar/RxJS,saneyuki/RxJS,benlesh/RxJS,figueredo/RxJS,adrianomelo/RxJS-1,adrianomelo/RxJSNext,martinsik/rxjs,saneyuki/RxJS,elliotschi/rxjs,martinsik/rxjs,adrianomelo/RxJSNext,benlesh/RxJS,Brocco/RxJS,RxJS-CN/RxJS-Docs-CN,mattpodwysocki/RxJS,adrianomelo/RxJSNext,SangKa/RxJS-Docs-CN,jadbox/RxJS,justinwoo/RxJS,kwonoj/RxJS,figueredo/RxJS,benlesh/RxJS,jadbox/RxJS,kwonoj/RxJS,robwormald/RxJS,ReactiveX/rxjs,staltz/RxJSNext,martinsik/rxjs,IgorMinar/RxJS,elliotschi/rxjs,gluck/RxJS,jayphelps/rxjs,ReactiveX/rxjs,adrianomelo/RxJS-1,RxJS-CN/RxJS-Docs-CN,adrianomelo/RxJS-1,justinwoo/RxJS,adrianomelo/RxJS-1,SangKa/RxJS-Docs-CN,ReactiveX/rxjs,ReactiveX/RxJS,kwonoj/RxJS,martinsik/rxjs,jinroh/RxJS,Brocco/RxJS