Fixed #18454 -- Added ability to pass a list of signals to receiver.

Added ability to use receiver decorator in the following way:

    @receiver([post_save, post_delete], sender=MyModel)
    def signals_receiver(sender, **kwargs):
        ...

django/dispatch/dispatcher.py

@@ -257,14 +257,21 @@ class Signal(object):
 def receiver(signal, **kwargs):
     """
     A decorator for connecting receivers to signals. Used by passing in the
-    signal and keyword arguments to connect::
+    signal (or list of signals) and keyword arguments to connect::
 
         @receiver(post_save, sender=MyModel)
         def signal_receiver(sender, **kwargs):
             ...
 
+        @receiver([post_save, post_delete], sender=MyModel)
+        def signals_receiver(sender, **kwargs):
+            ...
+
     """
     def _decorator(func):
-        signal.connect(func, **kwargs)
+        if isinstance(signal, (list, tuple)):
+            [s.connect(func, **kwargs) for s in signal]
+        else:
+            signal.connect(func, **kwargs)
         return func
     return _decorator