Set test as rake default task
Create Configuration Class to store PagSeguro credentials and redirect_url
updated spec_helper with a configuration for user and token and removed email and token generation for Payment factories
removed email and token parameters from Payment constructor.
change config method visibility on Payment to private
removed email and token parameters from Notification initializer.
Now, Notification delegates this methods to the Configuration Object
updated Notification specs initializer to use only the notification code parameter