Add USB load test from Mark Whitehorn
Adjust MAVLink RX prio to ensure received data can still be processed
Drop NSH priority to keep system responsive
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
Merge remote-tracking branch 'upstream/master' into ros
ros example: send rc_channels message