Updating the documentation with the actual sensor.  Added link to the datasheet.

This is the LSM303DLH, not the MMA7660FC.
The arduino utility wanted this in its own directory, so moving it.
Correctly coerce the two bytes read for the accelerometer and magnetometer axis into an int16_t.

The output values are valid now.
Moving it back into place.
Merge pull request #2 from bginter/master

Documentation and logic improvements, values corrected