The patch to check for CATKIN_ENABLE_TESTING has been included in
version 1.5.14.

This commit includes all navigation packages except robot_pose_ekf.
The robot_pose_ekf requires bfl, which we could not provide yet.

After configuring collada-urdf, the recipe modifies the generated
files to address the problem in #175. However, it does not solve
the root of this cause.

Main contribution by William (pull request #174) with minor
adjustments by Lukas Bulwahn.