Fix fee logic

* Should cause fee changes to be reflected on the website much faster than previously.

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/'
     );