Board manager for TABrain's board

Boardmanager settings for Arduino IDE

Corresponds to the following boards

IoTAB(V2)
- Arduino Zero(native USB) compatible board with MMA8451Q(14-bit Acceleration sensor) and STTS751(Temperature sensor)
SGIM(V1)
- Arduino Zero(native USB) compatible board with WSSFM10R3AT(Sigfox) and MMA8452Q(12-bit Acceleration sensor)