Make sqlite_backend Python3 compatible
Make sqlite_backend Python3 compatible

rsalmaso/huey,pombredanne/huey,happybits/huey,antoviaque/huey,coleifer/huey,charleswhchan/huey,deathowl/huey,charleswhchan/huey,angvp/huey,happybits/huey,oz123/huey,angvp/huey