At least, we should mention this in docs.

I know, this method waits for $browser.defers to be finished... But still feeling like we should add something like "notifyWhenNoPendingRequest" on $xhr level.. which would be called before $updateView():

So $xhr would handling $updating the view:

1. request is response is back from server
2. call success/error callbacks
3. notify no pending requests (or fire global event, whatever)
4. update view