Allow custom firmware flash on PX4Flow

Decreasing the angle jitter threshold for row, pitch and yaw.

travis-ci fixes

Joystick message fixes

When on Joystick config page:
- Not calibrating: If joystick is enabled, joystick messages should
continue to go to vehicle

Joystick fixes

Conflicts:
	src/Joystick/Joystick.cc

Fix center stick zero throttle, add JoystickValuesLog

New Joystick config, new Joystick control classes

Accidentally deleted somehow

[WIP] travis-ci OSX

Add Video option menu

Handle different vehicle position graphics based on the current map.

Add scrollbar to mission summary list

Mission items now show summary

Plus lots of other cleanup

Add Mission Items to Fly View