Added a conjugation_table function to the english module and some test
cases to test various conjugations. Added two new irregular verbs, as
well as a few new KEEP entries in tasks.py to track changes (pending in
the next commit) to the story rules.

-Peter Mawhorter
More progress on the story rules, but things are broken. I've got a
meeting in 20 minutes, so I'm committing now and rolling back to a
working state to do a demo.

-Peter Mawhorter