Use upstream liburdfdom-dev package.

Refs ros/rosdistro#4633.
Merge pull request #168 from pal-robotics/liburdfdom-dev

Use upstream liburdfdom-dev package.
Update changelogs.
0.8.1
Switch TravisCI to use indigo-devel.
Merge pull request #169 from pal-robotics/travis-indigo

Switch TravisCI to use indigo-devel.
Restore hydro for CI.
Merge pull request #170 from pal-robotics/travis-indigo

Restore hydro for CI.
Propagate urdfdom changes to CMakeLists.txt

urdfdom is now standalone, so it must be find_package'd independently.
Also, the rosparam rostest was not being built correctly.
Merge pull request #172 from pal-robotics/liburdfdom-dev

Propagate urdfdom changes to CMakeLists.txt
Update changelogs
0.8.2
fix spelling errors
Merge pull request #173 from shadowmanos/indigo-devel

Fix spelling errors
Add Python helpers to make life easier.

- Helper for getting all active controller managers.

- Helper for determining if a namespace contains the controller manager ROS API.

- Helpers for filtering the output of the 'list_controllers' service by
  type, name, state, hardware_interface and claimed resources.