Netflix/RxJava — pull request #1608 by davidmoten (2014-08-18 22:53:21+00:00)
Title: Add missing window with time overload

```Observable.window``` is missing an overload, the one overload to rule them all (couldn't resist).

The missing overload is below and corresponds to the ability to customize every parameter associated with the window with time functionality.

```public final Observable> window(long timespan, long timeshift, TimeUnit unit, int count, Scheduler scheduler)```