Fix issue 551
Fix issue 551

The correct way to import Image seems to differ depending on how
PIL was installed. This fix supports both ways of importing.

arifgursel/pyglet,Alwnikrotikz/pyglet,Austin503/pyglet,google-code-export/pyglet,arifgursel/pyglet,xshotD/pyglet,kmonsoor/pyglet,cledio66/pyglet,xshotD/pyglet,kmonsoor/pyglet,Alwnikrotikz/pyglet,odyaka341/pyglet,cledio66/pyglet,google-code-export/pyglet,google-code-export/pyglet,qbektrix/pyglet,cledio66/pyglet,xshotD/pyglet,Austin503/pyglet,kmonsoor/pyglet,shaileshgoogler/pyglet,Alwnikrotikz/pyglet,odyaka341/pyglet,gdkar/pyglet,Austin503/pyglet,odyaka341/pyglet,gdkar/pyglet,shaileshgoogler/pyglet,Alwnikrotikz/pyglet,arifgursel/pyglet,qbektrix/pyglet,odyaka341/pyglet,cledio66/pyglet,gdkar/pyglet,shaileshgoogler/pyglet,cledio66/pyglet,Austin503/pyglet,qbektrix/pyglet,odyaka341/pyglet,arifgursel/pyglet,xshotD/pyglet,xshotD/pyglet,gdkar/pyglet,Alwnikrotikz/pyglet,kmonsoor/pyglet,Austin503/pyglet,qbektrix/pyglet,arifgursel/pyglet,kmonsoor/pyglet,gdkar/pyglet,qbektrix/pyglet,google-code-export/pyglet,google-code-export/pyglet,shaileshgoogler/pyglet,shaileshgoogler/pyglet