Added on_start hook function to Locust class.
Added on_start hook function to Locust class.

timaakulich/locust,locustio/locust,RollForReflex/locust,ismail-s/locust,rohitgup14/locust,lixar/locust,yangchaogit/locust,wndhydrnt/locust,edx/locust,RollForReflex/locust,santiavenda2/locust,TZer0/locust,donglei/locust,kyroskoh/locust,pmdarrow/locust,agoragames/locust,RollForReflex/locust,dmoliveira/locust,cgoldberg/locust,nagyistoce/locust,Diogo-Costa/locust,doctoryes/locust,bugsduggan/locust,RollForReflex/locust,santiavenda2/locust,jaume-pinyol/locust,normanb/locust,armersong/locust,cloudant/locust,ismail-s/locust,armersong/locust,cgoldberg/locust,pan1cz/locust,nagyistoce/locust,moongtaeng/locust,kentzzhang/locust,harrisonfeng/locust,fordhurley/locust,TZer0/locust,Diogo-Costa/locust,scalp42/locust,pmdarrow/locust,bugsduggan/locust,noif/locust,fengshao0907/locust,dmoliveira/locust,pan1cz/locust,cloudant/locust,mbeacom/locust,cgoldberg/locust,cpennington/locust,agoragames/locust,rohitgup14/locust,lixar/locust,minhoryang/locust,edx/locust,edx/locust,donglei/locust,scalp42/locust,mbeacom/locust,donglei/locust,timaakulich/locust,agoragames/locust,harrisonfeng/locust,TZer0/locust,edx/locust,pmdarrow/locust,moongtaeng/locust,kentzzhang/locust,locustio/locust,minhoryang/locust,noif/locust,rackerlabs/locust,rohitgup14/locust,jaume-pinyol/locust,jacobgardner/locust,moongtaeng/locust,leo23/locust,cpennington/locust,cloudant/locust,pglass/locust,dmoliveira/locust,Diogo-Costa/locust,kyroskoh/locust,fordhurley/locust,yangchaogit/locust,nagyistoce/locust,fengshao0907/locust,fordhurley/locust,moongtaeng/locust,minhoryang/locust,wndhydrnt/locust,rohitgup14/locust,bugsduggan/locust,rackerlabs/locust,mbeacom/locust,dmoliveira/locust,wndhydrnt/locust,locustio/locust,fengshao0907/locust,jacobgardner/locust,normanb/locust,pglass/locust,donglei/locust,doctoryes/locust,yangchaogit/locust,pglass/locust,jacobgardner/locust,normanb/locust,timaakulich/locust,rackerlabs/locust,liubq919/locust,liubq919/locust,mbeacom/locust,noif/locust,kentzzhang/locust,doctoryes/locust,wndhydrnt/locust,leo23/locust,yangchaogit/locust,leo23/locust,ismail-s/locust,cpennington/locust,fengshao0907/locust,armersong/locust,Diogo-Costa/locust,harrisonfeng/locust,scalp42/locust,cpennington/locust,noif/locust,armersong/locust,kentzzhang/locust,cloudant/locust,jaume-pinyol/locust,heyman/locust,leo23/locust,lixar/locust,pan1cz/locust,kyroskoh/locust,lixar/locust,santiavenda2/locust,doctoryes/locust,locustio/locust,liubq919/locust