adds messages for motion retargeting
adds motion player and motions for Robosem
rosbagger: switches to boost::shared_ptr for handling instances of
rosbag::Bag (fixes #28 and resolves #29)
robosem_motions: adds new motions
robosem_mo_ret_ctrl: adds init for output handler
Merge pull request #30 from pal-robotics/motion_player

Motion player