Removed Nexus, switched to default backends

app/sso/backends.py

@@ -1,26 +0,0 @@
-from django.contrib.auth.backends import ModelBackend
-from django.contrib.auth.models import User
-from hashlib import sha1
-
-
-class SimpleHashModelBackend(ModelBackend):
-
-    supports_anonymous_user = False
-    supports_object_permissions = False
-    supports_inactive_user = False
-
-    def authenticate(self, username=None, password=None):
-        try:
-            user = User.objects.get(username=username)
-        except User.DoesNotExist:
-            return None
-
-        if '$' in user.password:
-            if user.check_password(password):
-                return user
-        else:
-            if user.password == sha1(password).hexdigest():
-		user.set_password(password)
-                return user
-
-        return None