Add depend on angles

The `angles` package is clearly referenced in the source at [1] and possible in other places. Therefore, it should `build_depend` and `run_depend` on `angles`.

This is causing failures on the buildfarm, and should be fixed and released.

Thanks!

--scott

[1] https://github.com/ros-controls/ros_controllers/blob/indigo-devel/effort_controllers/src/joint_position_controller.cpp#L43
[2] http://jenkins.ros.org/job/ros-indigo-effort-controllers_binarydeb_saucy_amd64/13/console