Fix fee logic

This pull should allow fee changes to be reflected on the website much faster than previously.

*  Fees are pulled from "webservice" (technically just a static csv file on server) - this removes the need for file copying
* Caching actually works now (bug previously made the feature none-functional)
* Cache busting logic added
* New cli method to refresh data (while retaining auto regen)

Requires new cron to:

     php artisan update-fees --env=www-live

Also requires update of fees config as `fees.path` now expects a web path rather than a local one

e.g.

      return array(
	  'path' 	=> 'http://kent.ac.uk/finance-student/fees/tuition/programmesplant/'
     );