Add logging and timer around pygments.highlight call when generating diffs.

Review Request #2180 — Created March 3, 2011 and discarded — Latest diff uploaded

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We've seen a few cases where pygments spins forever and never returns.  After looking at our logs, 5 seconds was about the longest it was taking to highlight anything so I put the timer at 10 seconds.
Our review board instance has been running with this patch for a few weeks now.