Added Pin Diagram

Added a pin out and pin diagram to the file. Set up the pins for the
device.
Basic magnetometer functions done

The basic functions are written, now they need to be tested and fixed.
Added initSensors function data

Also fixed the bug with the sensor not reading. There was a flipped bit
when I was sending the data.
Added Update Sensor Function

Writes the value of angle in to the NavData struct heading field.
Merge pull request #13 from AlexNorell/develop

Added Heading functionality.