redirects to party:show when party is created
adds item sorter method to party.rb to aggregate unique items for receipt
adds aggregation functionality to receipt preview in party:show
receipts with aggregated items seem to be displaying correctly
receipts aggregating correctly, refactored dumb currency instance methods
fixed bug with prices when validating new food input
receipt generator working! txt files looking good...for now
improved routing for placing new orders & foods now display by course