Commit for issues:

- monifu/monifu#11 - Implement the Reactive Streams protocol
- monifu/monifu#12 - Change the default behavior of Observable.merge
- monifu/monifu#13 - Observable.subscribe should return Cancelable
- monifu/monifu#14 - Get rid of monifu.reactive.api

Conflicts:
	monifu-rx/src/test/scala/monifu/reactive/BehaviorSubjectTest.scala
	monifu-rx/src/test/scala/monifu/reactive/BufferedObserverTest.scala
	monifu-rx/src/test/scala/monifu/reactive/ConnectableObserverTest.scala
	monifu-rx/src/test/scala/monifu/reactive/MergeTest.scala
	monifu-rx/src/test/scala/monifu/reactive/ObservableOperatorsOnRangeTest.scala
	monifu-rx/src/test/scala/monifu/reactive/ObservableOperatorsOnUnitTest.scala
	monifu-rx/src/test/scala/monifu/reactive/ObservableSanityTest.scala
	monifu-rx/src/test/scala/monifu/reactive/PublishSubjectTest.scala
	monifu-rx/src/test/scala/monifu/reactive/ReplaySubjectTest.scala