Aggregated results don't apply collection's transform

[Floriferous]

Grapher relies on mongo aggregations to perform queries sometimes. Aggregations don't apply a collection's transform to them, leading to very inconsistent results.

On the server for example, depending on if you fetch 2 linked documents one way or the other (virtual link, or not), the transform will not be applied.

This is what I meant in #186.

[theodorDiaconu]

That's a great find. We'll have to implement this.

[Floriferous]

This will be fixed if we merge #400 :)