Add fallback to parsing json string to `PGStore.get`
Add fallback to parsing json string to `PGStore.get`

Prior to postgresql 9.2 it doesn't have a json datatype. Let's give
people not having the luxury to use all the finest all the time a
chance to use this module.

voxpelli/node-connect-pg-simple,voxpelli/node-connect-pg-simple