ardrone interface: reduce stack size of start handler
ardrone interface: reduce stack size

Conflicts:
	src/drivers/ardrone_interface/ardrone_interface.c
Merge pull request #985 from PX4/ardronestacksize

Ardrone interface: reduce stacksize
drivers: Fix compile warnings and non-standard performance counter names
Merge branch 'master' of github.com:PX4/Firmware
mavlink: Compile warning fixes
apps: Compile warning fixes
Merge pull request #988 from PX4/warning_fixes_v2

Warning fixes v2
Merge branch 'master' of github.com:PX4/Firmware into gps_logging_dual