Custom errors

[reubenjs]

The errors raised are just an instance of RuntimeError. It would be more useful to have custom errors defined by the gem so that they could be handled in a more readable way.

For example, when checking if a contact (still) exists, if the answer is no, a Saasu::ResourceNotFoundError will be thrown.

Example code would be

      begin 
        Saasu::Contact.find(contact.saasu_uid)
      rescue Saasu::ResourceNotFoundError
        add_to_saasu(contact)
      end