Backport of MiniAccumuloCluster v1.5 to v1.4

[Corey Nolet]

The back porting of the proxy is pretty much complete. I have not submitted the 
patch yet because I am not able to run any automated integration tests without 
the mini Accumulo cluster. I've gotten pretty far with backporting the Mini 
Accumulo Cluster and it would be massively useful to have the it in v1.4 (if it 
works out well). Anyone against submitting a separate patch for this when it's 
complete?