Add confirmation prompt to `titan.sh clean`
Add confirmation prompt to `titan.sh clean`

elkingtonmcb/titan,kalatestimine/titan,CYPP/titan,samanalysis/titan,mbrukman/titan,amcp/titan,xlcupid/titan,wangbf/titan,wangbf/titan,kangkot/titan,twilmes/titan,hortonworks/titan,xlcupid/titan,twilmes/titan,elkingtonmcb/titan,twilmes/titan,anvie/titan,wangbf/titan,ThiagoGarciaAlves/titan,twilmes/titan,fengshao0907/titan,hortonworks/titan,evanv/titan,hortonworks/titan,kangkot/titan,qiuqiyuan/titan,xlcupid/titan,dylanht/titan,ThiagoGarciaAlves/titan,evanv/titan,mbrukman/titan,qiuqiyuan/titan,anuragkh/titan,elubow/titan,qiuqiyuan/titan,graben1437/titan,CYPP/titan,samanalysis/titan,evanv/titan,kangkot/titan,ThiagoGarciaAlves/titan,englishtown/titan,qiuqiyuan/titan,kalatestimine/titan,anvie/titan,thinkaurelius/titan,banjiewen/titan,twilmes/titan,pluradj/titan,nvoron23/titan,qiuqiyuan/titan,hortonworks/titan,graben1437/titan,banjiewen/titan,nvoron23/titan,banjiewen/titan,jamestyack/titan,jankotek/titan,CYPP/titan,anuragkh/titan,wangbf/titan,fengshao0907/titan,tomersagi/titan,kalatestimine/titan,infochimps-forks/titan,graben1437/titan,jamestyack/titan,nvoron23/titan,evanv/titan,anuragkh/titan,elkingtonmcb/titan,pluradj/titan,jankotek/titan,mbrukman/titan,CYPP/titan,wangbf/titan,infochimps-forks/titan,thinkaurelius/titan,elubow/titan,infochimps-forks/titan,tomersagi/titan,ThiagoGarciaAlves/titan,tomersagi/titan,banjiewen/titan,anuragkh/titan,kalatestimine/titan,infochimps-forks/titan,pluradj/titan,dylanht/titan,tomersagi/titan,englishtown/titan,boorad/titan,anuragkh/titan,elubow/titan,nvoron23/titan,mwpnava/titan,jamestyack/titan,samanalysis/titan,amcp/titan,englishtown/titan,mwpnava/titan,mbrukman/titan,boorad/titan,jamestyack/titan,elkingtonmcb/titan,anvie/titan,kangkot/titan,infochimps-forks/titan,jamestyack/titan,mbrukman/titan,samanalysis/titan,fengshao0907/titan,dylanht/titan,evanv/titan,jankotek/titan,anvie/titan,kalatestimine/titan,tomersagi/titan,boorad/titan,boorad/titan,elubow/titan,fengshao0907/titan,fengshao0907/titan,anvie/titan,jankotek/titan,jankotek/titan,xlcupid/titan,mwpnava/titan,elkingtonmcb/titan,ThiagoGarciaAlves/titan,amcp/titan,hortonworks/titan,thinkaurelius/titan,graben1437/titan,thinkaurelius/titan,mwpnava/titan,englishtown/titan,pluradj/titan,xlcupid/titan,amcp/titan,dylanht/titan,kangkot/titan,mwpnava/titan