Remove conflicting and unused last_activy method, order_by_activity.count now works
Remove conflicting and unused last_activy method, order_by_activity.count now works

akratech/Akraconference,mconf/mconf-web,mconftec/mconf-web-uergs,akratech/Akraconference,mconf/mconf-web,akratech/Akraconference,mconf-ufrgs/mconf-web,mconf-rnp/mconf-web,mconftec/mconf-web-uergs,mconf-ufrgs/mconf-web,mconf-ufrgs/mconf-web,mconf/mconf-web,mconf/mconf-web,mconf-rnp/mconf-web,mconf-rnp/mconf-web,mconf-ufrgs/mconf-web,mconftec/mconf-web-uergs,akratech/Akraconference,mconftec/mconf-web-uergs,mconf-rnp/mconf-web