Revert "Merge pull request #596 from esjewett/master" because the
dependency on hbase introduces netty-3.2.2 which conflicts with
netty-3.5.3 already in Spark. This caused multiple test failures.

This reverts commit 0f1b7a06e1f6782711170234f105f1b277e3b04c, reversing
changes made to aacca1b8a85bd073ce185a06d6470b070761b2f4.