add clean script to git clean before build
add clean script to git clean before build

nReality/SUGSA-ScrumGathering-App2016,nReality/AgileAfricaConf-app,nReality/AgileAfricaConf-app,nReality/SUGSA-ScrumGathering-App2016,nReality/AgileAfricaConf-app,nReality/SUGSA-ScrumGathering-App2016,nReality/SUGSA-ScrumGathering-App2016,nReality/SUGSA-ScrumGathering-App2016,nReality/AgileAfricaConf-app,nReality/SUGSA-ScrumGathering-App2016,nReality/AgileAfricaConf-app,nReality/SUGSA-ScrumGathering-App2016,nReality/AgileAfricaConf-app,nReality/AgileAfricaConf-app