Reducing pygame cpu-load to < 4 %

[C. Scott Ananian]

I have patched Pippy's examples to follow best practices for pygame,
so that the frame rate is limited to 20 FPS and games automatically
pause and suspend after 20 seconds of inactivity.  (These defaults can
be overridden.)

The patch is pullable from:
http://dev.laptop.org/git?p=users/cscott/pippy-activity-tmp;a=commitdiff;h=9df72c5591aee015089a4e96f9403183262dcc01
 --scott

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