Adding a little more flexibility to the group_by SelectQuery method
Adding a little more flexibility to the group_by SelectQuery method

Dipsomaniac/peewee,bopo/peewee,py4a/peewee,d1hotpep/peewee,Sunzhifeng/peewee,new-xiaji/peewee,lez/peewee,bopo/peewee,new-xiaji/peewee,Dipsomaniac/peewee,bopo/peewee,softside/peewee,coreos/peewee,mackjoner/peewee,giserh/peewee,jarrahwu/peewee,jnovinger/peewee,ronyb29/peewee,wenxer/peewee,teserak/peewee,fuzeman/peewee,zhang625272514/peewee,giserh/peewee,new-xiaji/peewee,ghukill/peewee,Sunzhifeng/peewee,zhang625272514/peewee,wenxer/peewee,coreos/peewee,jarrahwu/peewee,Sunzhifeng/peewee,coleifer/peewee,Dipsomaniac/peewee,stas/peewee,d1hotpep/peewee,fuzeman/peewee,coreos/peewee,zhang625272514/peewee,coleifer/peewee,jnovinger/peewee,jarrahwu/peewee,coleifer/peewee