Updated threading code for love 0.9.0
Updated target version number to 0.9.0
Updated window and graphics stuff to love 0.9.0
Updated joystick/gamepad code for love 0.9.0
Implemented joystick vibration
Merge branch 'master' into love-0.9.0
Pull in updated spike collision behavior
Fixed vibration bug when no joystick is present
Made game-over summary sections display one by one
Merge branch 'love-0.9.0'
Because LOVE 0.9.0 is officially released now