Rewrite kvaser_can_bridge as a Nodelet

[JWhitleyWork]

Many of AS's drivers allow the use of kvaser_interface for CAN communications but this currently requires either:

1. Integration of kvaser_interface as a library which must be a design-time decision or;
2. Running the kvaser_can_bridge as a stand-alone node, which is memory-inefficient because each message must be published to a network socket.

To achieve both flexibility and efficiency, kvaser_can_bridge should be re-written as a nodelet.