made it possible to disable signup

cookbook/helper/AllAuthCustomAdapter.py

@@ -0,0 +1,15 @@
+from django.conf import settings
+
+from allauth.account.adapter import DefaultAccountAdapter
+
+
+class AllAuthCustomAdapter(DefaultAccountAdapter):
+
+    def is_open_for_signup(self, request):
+        """
+        Whether to allow sign ups.
+        """
+        allow_signups = super(
+            AllAuthCustomAdapter, self).is_open_for_signup(request)
+        # Override with setting, otherwise default to super.
+        return getattr(settings, 'ACCOUNT_ALLOW_SIGNUPS', allow_signups)