oddb/pq: cache *sql.DB to pool postgres connection properly
oddb/pq: cache *sql.DB to pool postgres connection properly

SkygearIO/skygear-server,SkygearIO/skygear-server,SkygearIO/skygear-server,rickmak/skygear-server,rickmak/skygear-server,rickmak/skygear-server,SkygearIO/skygear-server