Index is in da house

So there are 5 sort properties and 3 filters for the user list, which is translated to
```
5 x 2 * (2 ^ 3 - 1) = 70
```
So if we want them all there are in total 70 indexes only for the user list.. the max on GAE is 200 :)
ah, i now got something similar to this after merging your current custom branch into my project.
it comes from the sign up stuff which uses `User.get_dbs(email=..., limit=1)`. This causes `Base.get_dbs()` to default to order by `-created`...
I see two options here:
- [ ] define the indices
- [ ] not use `User.get_dbs()` just for its limit but `user_dbs = model.User.get_by('email', form.email.data)` (will comment inline)