Release into ROS Indigo

[130s]

Please list if there are any technical & non-tech hurdles.

[k-okada]

no, if you want to change package structure as start-jsk/choreonoid#1, it's chance to do that. (but I think that is more difficult than current strategy if you want to keep current directory structure)

also do you think we need to add indigo for travis job?
start-jsk/rtmros_common#414 (comment)