WIP: optimization on displaying studies list

I got really tired of how slow is the studies display when having so many studies so I started working on https://github.com/biocore/qiita/issues/601. This is the initial optimization of /private/. I want to have some feedback before working on the others. 
Using more whitespace for structure, eg something like the following:

```sql
SELECT foo
FROM bar
WHERE (
    SELECT other_thing
    FROM table_a ta
        JOIN table_b tb ON ta.id=tb.id
    WHERE ta.thing=10
) AND (...)
```