Merge branch 'release/0.5.1' into develop
prepared development iteration of next version
Add cluster name getter and setter.
add do_mix rpc
do_mix method name should be `do_mix`
Merge pull request #22 from crow-misia/add_clustername_getter_setter

Add cluster name getter and setter.
change method name from {get,set}ClusterName to {get,set}Name (refs #22)
do_mix -> doMix
Merge pull request #23 from jubatus/feature/do_mix

add do_mix rpc
bump version
Merge branch 'release/0.5.2'