paypal payment
	modified:   app/models/bill.rb
	modified:   app/views/rasocomp/bills/_list.html.erb
	modified:   config/initializers/constants.rb
	modified:   config/locales/en.yml
Paypal Payment maybe working
	new file:   app/controllers/payment_notification_controller.rb
	modified:   app/models/bill.rb
	modified:   app/views/rasocomp/bills/_list.html.erb
	modified:   config/routes.rb
	new file:   db/migrate/20130118164323_add_paypal_transaction_id_to_bill.rb
Merge branch 'master' of github.com:RasoTeam/platform