Move last updated information to the party

We're displaying it on a per-candidate basis anyways, so this probably
makes sense to be on the `parties` table. Mainly instigated by the need
to account for Form 497 "Late" contributions.

Closes #289.
Merge pull request #310 from tdooner/form_497_date

Move last updated information to the party
Update map with new data.
Merge pull request #314 from mikeubell/master

Update map with new data.
Update map.csv
Merge pull request #315 from mikeubell/master

Update map.csv
Karamooz filed some "contributions".
Merge pull request #316 from mikeubell/master

Karamooz filed some "contributions".