Merge pull request #158 from atlasapi/purge-content

Add content purger
use kafka
fix AbstractMessageConfiguration
Merge branch 'kafka' into stage

* kafka:
  fix AbstractMessageConfiguration
  use kafka

Conflicts:
	pom.xml
	src/main/java/org/atlasapi/messaging/v3/AtlasMessagingModule.java
	src/main/java/org/atlasapi/messaging/v3/QueueFactory.java