Add USB load test from Mark Whitehorn
Merge pull request #1425 from PX4/usbtest

Add USB load test from Mark Whitehorn
L3GD20: Output gyro temperature in report
L3GD20: Fix typo
Merge pull request #1426 from PX4/gyrotemp

L3GD20: Output gyro temperature in report
added new sensor board rotation option (roll 270, yaw 270)
fixed style
Merge pull request #1429 from tumbili/board_rot

new_sensor_rotation_option
px4io: added RC_CONFIG, SET_OVERRIDE_OK and CLEAR_OVERRIDE_OK ioctls

this allows for full setup of RC override without needing param_get()
to PX4 specific parameters
px4io: added OVERRIDE_IMMEDIATE arming flag

this allows the flight code to choose whether FMU failure gives
immediate manual pilot control, or waits for the mode switch to go
past the override threshold