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
Port expander driver first hacky version
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
position_estimator_inav: remove acceleration from state and INAV_W_XXX_ACC parameters, more NaN checks
navigator: autocontinue and RTL autolanding fixes
FMUv1 board prettifying
Enable SPI4 for FMUv2
Add SPI4 init bits for FMUv2
Fix SPI select on port 4 to use the right defines
Count devices on SPI4 / EXT from 1 as for the other buses
Merge pull request #1017 from PX4/spi4_support

SPI4 support
Updated AR.Drone parameters

Flight tested May 7th, 2014.
Merge pull request #694 from thomasgubler/beta_homealtitudewarning

mission feasibility checker: add warning if waypoint is below home altitude
Merge pull request #1019 from PX4/beta

mission feasibility checker: add warning if waypoint is below home altitude
Increase UART1 & UART5 RX&Tx buffer sizes

To fix MAVLink message garbling problems.
Merge pull request #991 from Kynos/master

Updated AR.Drone parameters
Merge pull request #1009 from PX4/inav_fix

position_estimator_inav: stability fix