Databus working with ActiveMQ
ActiveMQ Mapper removed assumption that message body is only null with control messages
Centralized content types
MutateMessageIntentOfIncomingTransportMessages uses provided header constants
Mutate incoming transport messages with content type header if not available.
Removed unnecessary null header check because transport message ensure non null headers.
Fixed content type mutator
Using smarter encoding and decoding for active mq messages
Implemented IPublishMessages and IHandleScbscriptions interfaces
Merge branch 'develop' of git://github.com/NServiceBus/NServiceBus into develop

Conflicts:
	packages/repositories.config
Merge branch 'develop' of https://github.com/danielmarbach/NServiceBus into develop
Merge branch 'develop' of https://github.com/remogloor/NServiceBus into develop