Sends a POST to /1.0/notifications/email/ using this post-data:

            {"email": "andres.riancho@gmail.com",
             "first_name": "Andres",
             "last_name": "Riancho",
             "description": "Notification email"}

        :return: The id of the newly created email notification resource

def email_notification_add(self, notif_email, first_name='None',
                               last_name='None', description=DESCRIPTION):
        """
        Sends a POST to /1.0/notifications/email/ using this post-data:

            {"email": "andres.riancho@gmail.com",
             "first_name": "Andres",
             "last_name": "Riancho",
             "description": "Notification email"}

        :return: The id of the newly created email notification resource
        """
        data = {"email": notif_email,
                "first_name": first_name,
                "last_name": last_name,
                "description": description}
        url = self.build_full_url('/notifications/email/')
        return self.create_resource(url, data)