init: support --force option which forcibly (re-)creates storage dir
init: support --force option which forcibly (re-)creates storage dir

osrg/namazu,osrg/earthquake,osrg/namazu,osrg/earthquake,AkihiroSuda/earthquake,AkihiroSuda/earthquake,osrg/earthquake,fuku-ys/earthquake,fuku-ys/earthquake,osrg/earthquake,AkihiroSuda/earthquake,osrg/namazu,AkihiroSuda/earthquake,fuku-ys/earthquake,osrg/earthquake,osrg/namazu,osrg/namazu,osrg/earthquake,AkihiroSuda/earthquake,fuku-ys/earthquake,fuku-ys/earthquake,fuku-ys/earthquake,osrg/namazu,osrg/earthquake,fuku-ys/earthquake,AkihiroSuda/earthquake,fuku-ys/earthquake,AkihiroSuda/earthquake,AkihiroSuda/earthquake,osrg/namazu