* Major revision of node implementations:
  * Abstracted solid/body into geometry base classes
  * Abstracted joint classes for ode world
  * Revised solid/body node conception, path layout, etc.
  * New object implementation with anchor property for physically
    connecting objects
* Splitted simple world type into base world type without physics
  and panda world type
* Revised actuators:
  * Former PlanarMotor has been moved to PlanarDrive
  * Added LinearMotor, AngularMotor, and new PlanarMotor
* Improved Velodyne HDL-64E S2 sensor model
* Increased minor version