Create CAN_Trans_Sim.ino

This simulates the format that the LV board should provide data in. I think its pretty much right, but I haven't been able to confirm that all data is correct on the receiver end. 

The bit shifting is a pain to work out, but its taken from the packet description we got from Daniel.
Create CAN_Receiver.ino

Pretty basic receiver just to provide a start point for integrating it with the main launchpad code.

Where I'm at at the moment is that I can switch on the transmitter then receiver, and the transmitter confirms data is no longer pending. However, I haven't been able to check the data on the receiver yet and I'm not sure whether that might be due to ID masking, or other problems in the configuration.
Merge pull request #13 from T52/CAN_trans/receive

Can trans/receive