Adds mkdirp to the server package.json dependencies
Adds mkdirp to the server package.json dependencies

googledatalab/datalab,craigcitro/datalab,yebrahim/datalab,craigcitro/datalab,yebrahim/datalab,googledatalab/datalab,parthea/datalab,googledatalab/datalab,parthea/datalab,parthea/datalab,craigcitro/datalab,googledatalab/datalab,yebrahim/datalab,parthea/datalab,yebrahim/datalab,parthea/datalab,googledatalab/datalab,craigcitro/datalab,parthea/datalab,googledatalab/datalab,yebrahim/datalab,craigcitro/datalab