New package structure for the version 2 of the public api.

Start building up the validators required for post notificaiton.
The app/v2/errors.py is a rough sketch, will be passed a code, the error can look up the message and link for the error message.

app/notifications/process_notifications.py

@@ -0,0 +1,14 @@
+def persist_notification():
+    '''
+    persist the notification
+    :return:
+    '''
+    pass
+
+
+def send_notificaiton_to_queue():
+    '''
+    send the notification to the queue
+    :return:
+    '''
+    pass

app/notifications/validators.py

@@ -0,0 +1,25 @@
+from app.dao import services_dao
+from app.errors import InvalidRequest
+from app.models import KEY_TYPE_TEST
+
+
+def check_service_message_limit(key_type, service):
+    if all((key_type != KEY_TYPE_TEST,
+            service.restricted)):
+        service_stats = services_dao.fetch_todays_total_message_count(service.id)
+        if service_stats >= service.message_limit:
+            error = 'Exceeded send limits ({}) for today'.format(service.message_limit)
+
+            raise InvalidRequest(error, status_code=429)
+
+
+def check_template_is_for_notification_type(notification_type, template_type):
+    if notification_type != template_type:
+        raise InvalidRequest("{0} template is not suitable for {1} notification".format(template_type,
+                                                                                        notification_type),
+                             status_code=400)
+
+
+def check_template_is_active(template):
+    if template.archived:
+        raise InvalidRequest('Template has been deleted', status_code=400)