Finished shard compaction logic and tests
Updated tests and shard logic to be more efficient.  O(1) adds vs O( log n )
WIP, overwrite
WIP, overwrite
Adding utilities.  Need to fix bad multiget semantics for a merged iterator
Finished first pass of merge.  There appears to be a race condition on the take.
Merge branch 'USERGRID-188' of github.com:tnine/incubator-usergrid into USERGRID-188

Conflicts:
	stack/corepersistence/graph/src/main/java/org/apache/usergrid/persistence/graph/serialization/impl/shard/impl/NodeShardCacheImpl.java
Fixes issues.  Tests passing