Encoders, barometer, Magnetometer, Position module.
Merge pull request #24 from sdajani/shah57

Encoders, barometer, Magnetometer, Position module.
Added Ack, need to transfer over to Compass branch
Merge branch 'xbee' into compass

Conflicts:
	src/Mavlink.c
Moved position into Compas project. Fixed up Encoder module.
Started newletter, added accelerometer into CC.
Xbee Ack Working
Merge branch 'master' into compass

Conflicts:
	include/Xbee.h
	src/Compass.c
Merge pull request #26 from BananaSlug/compass

Compass
Added Magnetometer.h, fixed heading calculation. Improved command center.