Added ApplicationFee class.

- Currently supports listing, retrieving and refunding.

lib/stripe.rb

@@ -36,6 +36,7 @@ require 'stripe/event'
 require 'stripe/transfer'
 require 'stripe/recipient'
 require 'stripe/card'
+require 'stripe/application_fee'
 
 # Errors
 require 'stripe/errors/stripe_error'

lib/stripe/application_fee.rb

@@ -0,0 +1,21 @@
+module Stripe
+  class ApplicationFee < APIResource
+    include Stripe::APIOperations::List
+
+    def self.url
+      '/v1/application_fees'
+    end
+
+    def refund(params={})
+      response, api_key = Stripe.request(:post, refund_url, @api_key, params)
+      refresh_from(response, api_key)
+      self
+    end
+
+    private
+
+    def refund_url
+      url + '/refund'
+    end
+  end
+end

lib/stripe/util.rb

@@ -29,7 +29,8 @@ module Stripe
         'transfer' => Transfer,
         'recipient' => Recipient,
         'card' => Card,
-        'list' => ListObject
+        'list' => ListObject,
+        'application_fee' => ApplicationFee
       }
     end