Removed urdf_interface dependencies
Minor Doxygen fixes.

- Revert back to using \file instead of \brief, as the latter was documenting
  the namespace and not the file scope.

- Escape angular brackets on XML tag documentation, as Doxygen was parsing them
  printing warnings.

@davetcoleman
Merge pull request #88 from ros-controls/master

Merge master into hydro-devel for release to bloom
Merge branch 'hydro-devel' of github.com:ros-controls/ros_control into hydro-devel
Made joint_limits_interface match hydro version number
Created changelog for ros_control metapackage, but not the other packages
0.5.0
Added to maintainer list
Updated README.md
Merge branch 'hydro-devel'
Typo fix
Attempt to fix transmission interface tinyxml build error