Create a joint_trajectory_controller rqt plugin.

Initial plugin features:
- Allows to select any _running_ joint trajectory controller from any active
  controller manager.

- Two modes:
  - Monitor: Joint display shows actual positions of controller joints
  - Control: Joint display sends controller commands

- Max joint speed is read from the URDF, but can be scaled down for safety.
Merge pull request #103 from pal-robotics/rqt-jtc

joint_trajectory_controller rqt plugin
Fix initial sync of DoubleEditor widgets
Merge pull request #121 from pal-robotics/rqt-jtc

Fix initial sync of DoubleEditor widgets
add velocity_controller/JointPositionController in separate feature branch - feature provided by @davetcoleman
Add default-true parameter "~enable_odom_tf"
add velocity interface for joint_trajectory_controller in separate feature branch - feature provided by @davetcoleman
Add trajectory_interface headers to install target
Merge pull request #120 from pal-robotics/diff_drive_param_enable_odom_tf

Add default-true parameter "~enable_odom_tf"
Merge pull request #116 from ipa-fxm/feature/velocity_controllers/JointTrajectoryController_indigo

feature/velocity_controllers/joint_trajectory_controller rebased to indigo-devel
Merge pull request #117 from ipa-fxm/feature/velocity_controllers/JointPositionController_indigo

feature/velocity_controllers/joint_position_controller rebased to indigo-devel
Merge pull request #123 from pal-robotics/jtc-install-all-headers

Add trajectory_interface headers to install target
Merge branch 'indigo-devel' into indigo_joint_mode_controller