hk micro pcb startup script
rc.autostart entry for hk micro pcb quad
estimator: Fixed body / world matrix initialization and reset
Merge remote-tracking branch 'upstream/master' into hkmicropcb
Added NAV-TIMEUTC valid flag defines
hk micro pcb quad: change min pwm value
Merge branch 'est_reinit_fix'
Use NAV-PVT with ubx7 and ubx8 modules

This replaces NAV-SOL, NAV-POSLLH, NAV-VELNED and NAV-TIMEUTC.
Contributing notes
Changed branch name suggestion
Merge pull request #1114 from PX4/contributing

Contributing notes
Merge pull request #1113 from Kynos/gnss_nav_pvt

Use NAV-PVT with ubx7 and ubx8 modules
Merge remote-tracking branch 'upstream/master' into hkmicropcb
hk micro pcb quad startup script: add comment
mavlink: stack size for main thread increased
micro pcb quad: remove unnecessary setting
Merge pull request #1118 from PX4/hkmicropcb

Hk micro pcb quad: Startup script
Merge pull request #1117 from PX4/mavlink_stack_size

mavlink: stack size for main thread increased
Commander: Only consider latest active data link heartbeat for timeout.
Compiler warning fixes