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)
Merge branch 'usb_hil' into usb_do_not_merge