title: post_save signal isn't called
body: <p>I've already read all related questions.</p>
  
  <p>I have two Django projects, and signals work fine in one, but do not work in second one (I've just copy-pasted code and changed names respectively).</p>
  
  <p>I have an orders app with Order model. App is included in INSTALLED_APPS setting.</p>
  
  <p>I have app config in apps.py:</p>
  
  <pre><code>from django.apps import AppConfig
  
  
  class OrdersConfig(AppConfig):
      name = 'orders'
  
      def ready(self):
          super(OrdersConfig, self).ready()
  
          # noinspection PyUnresolvedReferences
          import signals
  </code></pre>
  
  <p><code>__init__.py</code>:</p>
  
  <pre><code>default_app_config = 'orders.apps.OrdersConfig'
  </code></pre>
  
  <p>And, finally, signals.py:</p>
  
  <pre><code>@receiver(post_save, sender=Order)
  def order_save(sender, instance, created, **kwargs):
      print 'Post save'
      if created:
          print 'Created'
          send_email_new_order.delay(settings.MODERATOR_EMAIL, instance.pk)
  </code></pre>
  
  <p>And signal does not getting called. Why?</p>
  
  <p>Django 1.10.3.</p>