ardrone interface: reduce stack size

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

Ardrone interface: reduce stacksize
perf: Allow printing to arbritrary fds
Log perf counters
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 remote-tracking branch 'upstream/master' into fwattrobustify

Conflicts:
	src/modules/fw_att_control/fw_att_control_main.cpp
fw att: add performance counter
Merge branch 'fwattrobustify' into mtecs
Merge branch 'master' of github.com:PX4/Firmware into gps_logging_dual
Introduced extended logging mode to shield general userbase from developer logging options
makefiles: check for correct arm-none-eabi-gcc version
Merge pull request #975 from PX4/fwattrobustify

Make the fw att controller more robust against infinite input
mc mixer: additional safe limiting of mixed out
navigator: takeoff fix, always reach takeoff altitude, even if first waypoint is lower
rc.mc_defaults: set default acceptance radius (NAV_ACCEPT_RAD) to 2m
Merge remote-tracking branch 'upstream/master' into mtecs