Clear reset_token upon successful login.

marietje/marietje/__init__.py

@@ -0,0 +1 @@
+import marietje.signals

marietje/marietje/signals.py

@@ -0,0 +1,10 @@
+from django.contrib.auth.signals import user_logged_in
+
+
+def on_login(sender, user, request, **kwargs):
+    if user.reset_token:
+        user.reset_token = None
+        user.save()
+
+
+user_logged_in.connect(on_login)