Hbase client

The most contentious part of this is the non-strict inequality on line 68. `simhash-db-py` uses non-strict inequalities for redis and HBase, but strict ones for Riak and MongoDB.
You could use `struct.pack` to use literal binary integers in your column name. That will ultimately be more space efficient, but make using `hbase shell` and direct interaction with the database a little more difficult.