Initial commit for rqt controller manager plugin.  Plugin seems functional from first tests.  Allows users to unload/load/start/stop/view available controllers.  No functionality yet exists for loading a controller from scratch.
Resources -> Claimed Resources column title
Added controller namespace detection and switching, loadable controller parameter detection and buttons for loading or starting the controller directly from the parameter server.
Merge pull request #132 from kphawkins/hydro-devel-rqt-plugin

Initial release for a rqt controller manager plugin