Merge pull request #2 from junegunn/devel

Merge 0.2.1 changes
Merge pull request #3 from junegunn/devel

Merge 0.2.2 changes
Issue #6: Add CDH4.2 profile
Issue #4, issue #5. Prepping for 0.2.3
Merge branch 'devel' of github.com:junegunn/hbase-jruby into devel