tone_alarm: add EKF_WARNING tune

Conflicts:
	mavlink/include/mavlink/v1.0
Return 0 for a non-reset
Merge branch 'master' of github.com:PX4/Firmware
Do not abort on submodule init feedback
UAVCAN update for #1229
update comment about condition_global_position_valid
UAVCAN update for #1229 (windoze)
Merge pull request #1230 from PX4/posvalidcomment

update comment about condition_global_position_valid
Merge branch 'filter_mode' into asfilter
Merge remote-tracking branch 'upstream/master' into asfilter
Increase filter pass-band