Print git submodule initialization instructions if any submodules are missing
Print git submodule initialization instructions if any submodules are missing

jeresig/processing-js,baiyanghese/processing-js,kevinb7/processing-js,kevinb7/processing-js,jaredly/processing-js,baiyanghese/processing-js,jeresig/processing-js,guazipi/processing-js,guazipi/processing-js,jaredly/processing-js