0.9.0 (2012-2-15)

• tickets closed: 25, 72, 110, 111, 117, 118

• turtlebot_driver: now supports 500 series Roombas

• turtlebot_node: calibration for the newer gyros has been improved

• turtlebot_node: now exposes more parameters

• turtlebot_description: urdf now supports Asus Xtion and Hokuyo laser

• turtlebot_node: odometry persists when serial interface goes down