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
Merge pull request #94 from davetcoleman/hydro-devel

Fix transmission interface tinyxml build error
Merge branch 'hydro-devel' of github.com:ros-controls/ros_control
Trivial cleanup
Created changelogs for all packages
Updated CHANGELOGS
0.5.2
Duplicated URDF's method of including tinyxml
Updated changelog
0.5.3
Duplicated urdfdom's method of including tinyxml