Merge branch 'release/0.5.1' into develop
add do_mix rpc
Merge pull request #34 from jubatus/feature/do_mix

add do_mix rpc
add accessors to get/set cluster name (fix #31)
Merge pull request #35 from jubatus/fix-31

Add accessor to get/set cluster name (fix #31)
bump version
Merge branch 'release/0.5.2'