Add some options to get queries

[Unitech]

• Limit option
• Sort option

[mchapman]

Hi

I have implemented this in what should have been a fork, but I didn't really know how it was going to turn out so I just copied and hacked. If you want to see what I have done it is at https://github.com/mchapman/forms-angular/blob/master/server/lib/data_form.js (it is on my jobs list to properly fork). It may give you some ideas (which you may think are good or bad!).

Mark