[SQLObject] patch for pgPySQL

[Jean-Philippe Barrette-L. <jpb...@sa...>]

I modified SQLObject to be able to use pgPySQL. here's the patch. If you don't 
like it, just tell me what's wrong and I'll change it to fullfill your needs.

-- 
Jean-Philippe Barrette-LaPierre
Maintener of curlpp