mission feasibility checker: add check for waypoint altitude relative to home position altitude
mission feasibility checker: remove audio warning for waypoint below home altitude
mission feasibility checker: add missing default return in checkHomePositionAltitude
autostart 10016_3dr_iris: yaw PID parameters updated
Port expander driver first hacky version
ets airspeed: Support raw field
Merge branch 'master' of github.com:PX4/Firmware into master2
Fixed up SNR logging to include maximum 32 satellites (which is plenty even for future, not yet deployed global positioning systems)
perf: Allow printing to arbritrary fds
Log perf counters
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
Removed obsolete flow control example
Allow any GCC 4.7 subversion