Less verbose init logging.

Statement detailing controller joint count, as well as segment and hardware
interface types moved from INFO to DEBUG severity.
Fix license header string for some files.
Create README.md
Update README.md
Silence cppcheck warning on unit'ed variables.
Added check for ~/robot_description and fixed hardware interface abstraction bug
PID sign was wrong
Merge branch 'hydro-devel' of https://github.com/willowgarage/ros_controllers into hydro-devel
Flip state error sign.
Merge pull request #45 from ros-controls/effort_fixes

Added check for ~/robot_description and fixed hardware interface abstraction bug
Remove PID sign flip.

This is now done in the state error computation.
Add joint_trajectory_controller to metapackage.
Added more debug and error information
Merge branch 'hydro-devel' of github.com:ros-controls/ros_controllers into hydro-devel
Removed xacro dependecy for Groovy since it is not catkinized
Merge branch 'groovy-backported-hydro' into velocity_position_controller