Merge pull request #92 from davetcoleman/master

Attempt to fix transmission interface tinyxml build error
Added new maintainer
Modified changelog
0.5.1
Restore urdf dependencies.

Add conditional compilation for Fuerte and Groovy+ distros.
Fix for joint_limits tests in catkin
Merge pull request #93 from pal-robotics/master

joint_limits_interface broken in Groocy and Hydro
Fixed gtests for joint_limits_interface in catkin
Merge branch 'hydro-devel' of github.com:ros-controls/ros_control