remove pre_save and add perform_create and update methods to weight app
remove pre_save and add perform_create and update methods to weight app

wger-project/wger,petervanderdoes/wger,rolandgeider/wger,kjagoo/wger_stark,DeveloperMal/wger,DeveloperMal/wger,wger-project/wger,DeveloperMal/wger,rolandgeider/wger,petervanderdoes/wger,DeveloperMal/wger,wger-project/wger,rolandgeider/wger,petervanderdoes/wger,kjagoo/wger_stark,rolandgeider/wger,petervanderdoes/wger,kjagoo/wger_stark,kjagoo/wger_stark,wger-project/wger