removes old user-handling libs from core.py
removes old user-handling libs from core.py

total-impact/total-impact-webapp,total-impact/total-impact-webapp,Impactstory/total-impact-webapp,total-impact/total-impact-webapp,total-impact/total-impact-webapp,Impactstory/total-impact-webapp,Impactstory/total-impact-webapp,Impactstory/total-impact-webapp