Made username creation/login case insensitive.

src/web/backends.py

@@ -0,0 +1,17 @@
+from django.contrib.auth.backends import ModelBackend
+from django.contrib.auth.models import User
+
+class CaseInsensitiveModelBackend(ModelBackend):
+  """
+  By default ModelBackend does case _sensitive_ username authentication, which isn't what is
+  generally expected.  This backend supports case insensitive username authentication.
+  """
+  def authenticate(self, username=None, password=None):
+    try:
+      user = User.objects.get(username__iexact=username)
+      if user.check_password(password):
+        return user
+      else:
+        return None
+    except User.DoesNotExist:
+      return None