Prevent scary ActiveRecord warning
Remove TomsCache because we don't use CSV anymore
Add counter caches to count contributions received and sent
Make SocrataFetcher implement Enumerable
Add contributions count to candidates tables
Merge remote-tracking branch 'origin/master'

* origin/master:
  Serve JSON with correct Content-Type
  Remove local data CSVs
  Fix nested SQL causing ActiveRecord deprecation warning

Conflicts:
	app.rb