Aligned backpressure defintion to v2.3.
Removed clear, contains from CompositeDisposable.
Made SerialDisposable be an alias of SingleAssigmentDisposable.
Added helpers.isFunction; added thisArg to Observer.fromNotifier; added Observable.subscribeOn*.
Added tap, doOn*, tapOn*, throwError, catchError.
Fixed `takeLast`, added `pluck`, `config.useNativeEvents`.
Moved removed `rx.time` operators from rx.time-lite to rx.time.
Update promises for Issue #327
Update events for Issue #327
Adding more docs for config for Issue #327
Adding more docs for transducers for Issue #327
Fixing doc readme for Issue #327
Closing Issue #319
Version bump
Fixing TKO example
Updating docs for Issue #327
Updating docs for Issue #327
Updating docs for Issue #327
Updating docs for Issue #327
Updating git attributes