Allow multiple -e arguments.
Allow multiple -e arguments.

Also fix a bug with -p +foo having an incorrect target property name.

ongerit/topojson,hcxiong/topojson,maxogden/topojson,studiowangfei/topojson,koshlan/topojson,AlpinHologramm/topojson,whoinlee/topojson,mbostock/topojson,lyhpcha/topojson,ststeiger/topojson,btahir/topojson,youprofit/topojson,tsl3su/WorldMap_Choropleth