Refactoring Tickets

- Tickets now independent from registration
- Implemented money gem
#419

db/migrate/20140819124315_rename_supporter_level_to_ticket.rb

@@ -0,0 +1,9 @@
+class RenameSupporterLevelToTicket < ActiveRecord::Migration
+  def up
+    rename_table :supporter_levels, :tickets
+  end
+
+  def down
+    rename_table :tickets, :supporter_levels
+  end
+end