mussel: fix ip command path using full path.
mussel: client_ipaddr -> api_client_addr.
Merge pull request #262 from axsh/feature-mussel-client-addr

Feature mussel client addr
update ruby version to 2.0.0.
remove unnecessary files.
Rakefile: update dependency gem version.
bump version to v13.08.
Merge pull request #263 from axsh/release-v13.08.0

Release v13.08.0
Merge pull request #264 from axsh/feature-volume-localstore

Fix API endpoint & image clone issues
add yaml convert functions.
mussel: add "mussel volume backup" sub-command.