Clarify node-pg's strategy for the JSON data type in Postgres

Hi Brian,

Could you please mention what you think node-pg should be doing to handle the JSON data type that appeared in Postgres 9.2?

I've asked for more info here previously:

https://github.com/brianc/node-postgres/issues/208#issuecomment-12026997

It'd be ideal if node-pg could parse or stringify the value of the json column going out or coming into postgres. If you need a hand with it let us know (although I also said that about node-sql and we've been super busy). In the interim we need to form a strategy for handling json data using node-pg.

Cheers!
Nick