Serialize instance

```
Hi

I've build a GUI for none SQL users using Squiggle, and I think it have been a 
great succes.

I have tried to add functionality to serialize a query instance, but I have no 
succeded doing that until now.

Have anyone done that, or can help me adding this functionality?

Regards Ole 


```

Original issue reported on code.google.com by `O.Lindbj...@gmail.com` on 16 Jun 2014 at 6:05
