Added an application menu with a quit menu item so that CMD-q exits app.
Added an application menu with a quit menu item so that CMD-q exits app.

--HG--
branch : cocoa-port

infowantstobeseen/pyglet-darwincore,infowantstobeseen/pyglet-darwincore,infowantstobeseen/pyglet-darwincore,infowantstobeseen/pyglet-darwincore,infowantstobeseen/pyglet-darwincore