Added MAVLink-transmitted calibration warning about bad sensor calibration as part of preflight check
Merge pull request #231 from PX4/calibration_warning

Added MAVLink-transmitted calibration warning about bad sensor calibrati...
Fix the CamFlyer mixer
Merge pull request #233 from sjwilks/mixer

Fix the CamFlyer mixer
HOTFIX: correct some logic errors with SPI chipselect generation.
Tested by Tridge.
Ensure that numerator / demoninator <= 1.
Merge pull request #235 from sjwilks/io-twitch

Stop the servo suddenly jumping when it goes out of the deadzone in one direction
Hotfix: Apply same (correc) deadzone logic from IO fix to FMU as well
Added startup scripts useful when running USB consoles, made MAVLink aware that /dev/console is a hint for running on USB (magic strings, magic strings)
Fixed copy & paste documentation lies
Merge pull request #240 from PX4/usb_hil

Added startup scripts useful when running USB consoles, made MAVLink awa...
Added seatbelt fixedwing controller.
Flipped simple mode pitch/throttle channel input.
Fixed PID roc2Thr param names/ added them to controldemo.
Fixed a comment.
Added pressure alt measurement to kalman demo.
Butchered position estimator from Damian Aregger into shape, publishes now global position estimate as well. Compiling, needs HIL testing
Improved HIL startup script, added highres HIL receive routine
Fix gyro measurement noise variance
Hotfix missing yaw deadzone default (leads to continuous turns since zero speed is never commanded)