Update changelogs for 0.5.3.
0.5.3
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 package for diff_drive_controller.
Had to create a modified version of CMakeLists.txt for qt creator to work, will remove later.
Added odom message type + fixed loading problems of plugin.
Added parameter and simple urdf parsing and realtime odometry publisher.
Added subscriber + real time stuff for cmd_vel subscription. Robot moves with joystick.
Fixed speed problems.
Added Odometry class refactored from old code. Updated manifest for dependencies.