20140118 - Change receiver selection to a toggle, fix interrupt conflict
when switching receiver types.
20140201 - Split rateScaling into two variables, rollAndPitchRateScaling
and yawRate scaling.
20140211 - Battery Monitor debug complete.
20140301 - Battery monitor trip points in EEPROM, tricopter mixing
improvements, free mix
20140402 - Simple Mode
20140407 - mavlink and mpu accel calibration
20140421 - Comm updates, mavlink switching
20140421 - Update Rev4 and Rev5 hex files