readd missing optimized HBridge.get() implementation

this was an optimzation that existed in the 1.1.6.1 release, but does
not exist in the current release.

also bumped version to 1.1.8-SNAPSHOT

Testing Done:
 - Built enlightener against this and ensured that HBridge.get() works
   (verified "Cache misses" on the Datastore Contention card followed
   by successful HBase queries)
Merge pull request #4 from aboyett/optimize-get

readd missing optimized HBridge.get() implementation