Switch to a twisted.plugins based plugin loader.

Removes the ability to swap out old code for new code, since that was a
property of exocet.

Based on @uberj's patch at
https://github.com/uberj/hamper/commit/87ad26647683038a28713eb495e7b5169698eaab

changes. Lines starting
Remove unused bravo and exocet dependencies.
Cleanup.
flips
addresses long_desc issue
Merge pull request #10 from uberj/flip

flip it good.
License under MIT
First working db-powered factoid!
Factoid /mes and triggers.
Forget about that.
Fix reply.
Core: message contains target if target is not hamper.
karma: the start of the Karma plugin
karma: added name so karma can be found

fix typos and other cleanup as well
karma: ++ and -- for adding and removing karma
karma: top and bottom arguments added

shows the top or bottom 5 karma counts
karma: pull up the karma for a given user

some comments changed as well
karma: pep8 cleanup
karma: add short and long descriptions
Clear up README a bit.