Prints a list of all registered receivers. Including signal, plugin name and description.

def list_receivers(self):
        """
        Prints a list of all registered receivers. Including signal, plugin name and description.
        """
        print("Receiver list")
        print("*************\n")
        for key, receiver in self.app.signals.receivers.items():
            print("%s <-- %s (%s):\n  %s\n" % (receiver.name,
                                               receiver.signal,
                                               receiver.plugin.name,
                                               receiver.description))