Added RNH command documentation
Fixed Readme formatting
Fixed netmask in net_addrs from /8 to /24
Added missing adis zgyro field to flight-imu
Added more flight conditional build sections, removed connect
Merge branch 'master' of github.com:psas/stm32
Updated gps ip address
Made COTS GPS not desync
Fixed rci select return value check

Select returns 0 on a timeout, not -1
Removed attepts at framing from flight-gps
Fixed RNH umbilical detect

It helps to have the right pin, and to actually start the ext driver
Simplified watchdog driver
Promoted iwdg to high level driver
Added general watchdog to RNH

Fixes #56
Fixed signedness of MPL temperature
Added servo command watchdog

If the servo is enabled and hasn't had a command in 1 second it will
default to the center actively. Fixes #55

Also cleaned up debug servo limiting
Added flight build only watchdogs to all flight- projects
Added flight make target

Still isn't great but I'm in the middle of the desert and don't
have The GNU Make Manual handy
Merge remote-tracking branch 'upstream/master'
minor cleanup