Initial version of namespace/value aliases, including persistence and lookup but not output/migration
Altered lookup by namespace/value so both namespace present and absent can be covered by a single index
Merge branch 'master' into mbst-4008-atlas-aliases

Conflicts:
	src/main/java/org/atlasapi/media/channel/MongoChannelStore.java
	src/test/java/org/atlasapi/media/channel/MongoChannelStoreRetrievalTest.java
Merge pull request #60 from atlasapi/mbst-4008-atlas-aliases

atlas aliases