Moved all workers over to cron

The workers no longer do their horrific sleep loop. Instead they are initiated
by cron using the clockwork gem, with an additional midnight averages DB rebuild
to fix any possible issues which occur over time. I get average assets issues
when I restart the server quickly during development, so this is to clean it up.
Merge branch 'master' of https://github.com/hak8or/cryptos

Conflicts:
	config/initializers/secret_token.rb