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 :)
It's only one more index: Index(User, email, -created), zigzag merge does the rest (just tested).
Or replace the also the two other uses of `User.get_dbs(email=..., limit=2)` with `User.query(User.email ==).fetch(2)`?
Which one do you prefer?