Fix to Radio Channels PWM values to use a dark colour when 'outdoor' style is selected.
Added warning dialogs to pre flight commands that can cause a vehicle to crash if not on the ground.
Fix for selecting trunk firmware changing the name of the beta firmware button
Fix for #52, where PX4 upload thread didn't exit properly on an error condition involving unplugging the device in the middle of flashing
Merge remote-tracking branch 'upstream/master'