Baro MS5611: add nav.h for ground_alt (although not used), change
I2C address to 0xEE for CSB\ low (as in most boards as Aspirin2.1,
FreeIMU 0.4.3, ...)
[imu] aspirin2: suppress unused arg warning
[stm32] convert SpektrumParser from macro to static inline function
Add centidegrees
Add Aeroprobe On-The-Fly! air data computer interface
naming foo
[modules] minor prettify
[settings/gcs] save and display settings as integer if step is integer

close #381
[sonar] some fix for sonar module

sonar_scale is now a float in m/adc
[CDW] Airframes
[xml] Tricopter
[xml] AscTec
[CDW] update airframes
[CDW] Imu Quality Assessment