B4R Library rMCP2515

This is a wrapper for MCP2515 library: https://github.com/franksmicro/Arduino/tree/master/libraries/MCP2515

The receiveCANMessage and transmitCANMessage messages are not exposed. They can be added if needed.

The constants for the baud settings are:
1 = CAN_BAUD_10K
2 = CAN_BAUD_50K
3 = CAN_BAUD_100K
4 = CAN_BAUD_125K
5 = CAN_BAUD_250K
6 = CAN_BAUD_500K