Original port of roomba_robot to a catkin build.  Many of the components (the iRobot Open Interface library, the msgs & the node, were split into different packages, for easier re-use... should anyone be interested.  Migrated from cereal_port library to serial because it serves the same functionality and it already suppots catkin & the target distros (groovy, hydro and so on). Roomba_robot metapackage also created.