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

MotionSensor class

Andrew, This version implements the virtual MotionSensor class that we are moving to in order to provide a standard API for Megnetometers, Accelerometers and Gyros

Added function to retrieve raw data from sensor