Added a test for the pygame joystick.
source: http://pygame.org/docs/ref/joystick.html
First attempt of implementing joystick compatibility.
Added buttons to joystick.
Merge branch 'master' into joystick

Conflicts:
	graphics/window.py
Added joystick button support to settings screen.
Added setting for activating the joystick.
Added settings type and entry for joystick entry.