TiltCompass finished and logger started
Copied logger code over.
Merge pull request #42 from ddeo/master

Rudder control started implementation.
Merge branch 'logger-compass'
Integrated drive code with state machine.
Finished simple SD logging module. Compiles, ready to test.
Navigation test with override ready. Need origin..
Finished and tested logger module.
merged rudder init with drive init and changed some test harnesses to test rudder control. It works fine.