Simple library for MAG3110 magenetometer as built into Avnet Wi-Go module

Dependencies:   MotionSensor

Dependents:   Wi-Go-MagnetometerTest EE202A_HW1_MH serialtoxively mbed_nanosec_timer ... more

This pull request has been accepted and merged in by Andrew Lindsay

Added method to get raw sensor data

Andrew, I added a method to get raw data from the sensor as this was needed by the Freescale eCompass library

Added function to retrieve raw data from sensor