[issue17172] Add turtledemo to IDLE menu

[Lita Cho]

Lita Cho added the comment:

I tested the patch and it looks correct upon inspection. It looks like it applies cleanly and a straight forward solution. 

I made a slight change so that when the Demo exits, it has a better message. I also added the change to the NEWS.txt file. 

I also ran the IDLE tests, and everything passed. I didn't see new tests added, but I am not sure if that is needed, since we are just adding a menu binding.

I've attached my patch with the changes listed above. It should be ready for review.

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nosy: +Lita.Cho, jesstess
Added file: http://bugs.python.org/file35328/issue.patch

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