Mark Broadcast methods as pure
Mark Broadcast methods as pure

This neat annotation will at least let people using IntelliJ IDEA
know that they need to be using the returned Observable from send
or valuesOfType.

whymarrh/RxBroadcast,RxBroadcast/RxBroadcast,RxBroadcast/RxBroadcast,whymarrh/RxBroadcast,RxBroadcast/RxBroadcast,RxBroadcast/RxBroadcast