Added RGB+3D-sensor interface (Primesense/Kinect/Xtion).
 * Publishes CameraInfo, depth image, RGBA image, tf (takes world-file pantilt paremeter into account)
 * Supports the "old" configuration (laser+odom) as well as camera+odom, laser+camera+odom and odom-only.

Fixed laser transform height (previously was hardcoded at 0.15, now it takes robot height into account).