Add new "public Observable<UUID> getLatestVersion( Id entityId )" method to the collection manager.
Change query result building logic to discard stale CandidateResults in all cases, and to do repair by reindexing each stale candidate found.
Merge branch 'two-dot-o' of https://git-wip-us.apache.org/repos/asf/incubator-usergrid into collection_multiget

Conflicts:
	stack/corepersistence/collection/src/main/java/org/apache/usergrid/persistence/collection/EntityCollectionManager.java
	stack/corepersistence/collection/src/main/java/org/apache/usergrid/persistence/collection/impl/EntityCollectionManagerImpl.java
	stack/corepersistence/collection/src/test/java/org/apache/usergrid/persistence/collection/EntityCollectionManagerIT.java
Initial refactor of results loading to use multiget.  Need to push load logic down to impelmentations.