Update baxter urdf to reflect latest changes - addition of head_camera frame.
Update baxter urdf to reflect latest changes - addition of head_camera frame.

baxter-flowers/baxter_tools,davetcoleman/sdk-examples,Sannoso/baxter_examples,jaspell/baxter_examples,wjchen84/baxter_examples,RethinkRobotics/baxter_examples,RethinkRobotics/baxter_tools,umassrobotics/baxter,davetcoleman/sdk-examples,umassrobotics/baxter,RethinkRobotics/baxter