FORGE-137 - add ticket diff -- adds items to feed, nowhere else

This commit includes
- code to put a ticket diff in the RSS/Atom feed
- test

Longer-term, I think we probably need to expose the feeds on artifact pages as a
"cheap" way to do history. For right now, this is just a discoverable feed.

Rick Copeland Rick Copeland 2010-02-12

changed ForgeTracker/forgetracker/model/ticket.py
changed ForgeTracker/forgetracker/tracker_main.py
changed pyforge/pyforge/tests/functional/test_feeds.py
ForgeTracker/forgetracker/model/ticket.py Diff Switch to side-by-side view
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ForgeTracker/forgetracker/tracker_main.py Diff Switch to side-by-side view
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pyforge/pyforge/tests/functional/test_feeds.py Diff Switch to side-by-side view
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