Reduce ROMFS footprint
Reduce too chatty content, de-allocate non-needed string buffers
fix variable name in rc.uavcan
rename PWM_OUTPUTS to PWM_OUT in all files
rename DO_AUTOCONFIG to AUTOCNF in all files
Update UAVCAN version, delete outdated example
Remove unmaintained math demo
Fix build breakage in FW control example
Fix / update HW test example
Enable examples by default to ensure they get maintained on API changes
Update NuttX with critical bugfix from Greg
changed telementry connection lost warnings to info in order to avoid audio message flooding in case of instable connections.
Give Skywalker its own mixer
Merge pull request #1491 from friekopter/remove_lost_audio

removed audio messages
Merge remote-tracking branch 'upstream/master' into romfs_clean

Conflicts:
	ROMFS/px4fmu_common/init.d/rc.interface
	ROMFS/px4fmu_common/init.d/rcS
Merge pull request #1461 from PX4/romfs_clean

Romfs clean
ROMFS: rc.interface: Make output less verbose to clutter boot log less
ROMFS: Better commenting, save some more RAM
mavlink: distance sensor: fix max value
Merge pull request #1494 from PX4/mavlinkdistancesensor

mavlink: distance sensor: fix max value