hand_of_god: Adding hand-of-god plugin

ros_force: Fixing error messages to refer to the right plugin
hand_of_god: Improving servoing, gazebo math api is wonky
ros_camera_utils: Adding CameraInfoManager to satisfy full ROS camera API (relies on https://github.com/ros-perception/image_common/pull/20 )

ros_camera_utils: Adding CameraInfoManager to satisfy full ROS camera API (relies on https://github.com/ros-perception/image_common/pull/20 )
Merge remote-tracking branch 'origin/hydro-devel' into camera-info-manager
Merge branch 'hand-of-god' into hydro-devel
Merge branch 'camera-info-manager' into hydro-devel