[OLPC-Games] Kuku: Don't reload images

[Christopher Schmidt]

Two bugs, one fixed, one outstanding:
 * tile.py:draw() is called too often. 
 * when draw() is called, and hence set_answer, it reloads the image, even
   if the image name is exactly the same.

The first I haven't dug into yet, though I think I found out where it
was earlier.

The second is fixed by the attached patch.

(Still figuring out git -- let me know if there's a better way to get
this together?)

Regards,
-- 
Christopher Schmidt
MetaCarta
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