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.
Fix the CamFlyer mixer
Merge pull request #233 from sjwilks/mixer

Fix the CamFlyer mixer
Merge branch 'seatbelt_controllib' of https://github.com/jgoppert/Firmware into seatbelt
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...
Merge pull request #234 from PX4/seatbelt

Seatbelt for fixed wing
Merge remote-tracking branch 'upstream/master' into merge_upstream