Update rabbitmq to 3.0.4

Major changes in 3.0.0:
- Policy-based configuration of mirroring and federation
- Revamped clustering commands
- Web-STOMP and MQTT plug-ins
- Per-message TTL

Too many bugfixes since 2.8.2, please see individual changelogs:

http://www.rabbitmq.com/changelog.html
Update wip submodule