fix typo in model dir default; improve usage
fix typo in model dir default; improve usage

antek-drzewiecki/cequel,edpaget/cequel,visfleet/cequel,cequel/cequel,AdStage/cequel,orenmazor/cequel,Galeria-Kaufhof/cequel,antek-drzewiecki/cequel,orenmazor/cequel,jhannus/cequel,lesliev/cequelb,elgalu/cequel,lesliev/cequelb,lesliev/cequel,zenonas/cequel,maxpospischil/cequel,shaqonline/cequel,devnut/cequel,Galeria-Kaufhof/cequel,elgalu/cequel,shaqonline/cequel,cequel/cequel,AdStage/cequel,edpaget/cequel,visfleet/cequel,zenonas/cequel,lesliev/cequel,bobbrez/cequel,bobbrez/cequel,jhannus/cequel,devnut/cequel,maxpospischil/cequel