Install nbpdfexport
Install nbpdfexport

For a latex-free pdf export experience

Also move the R installs way down so we don't re do a lot
of stuff whenever the R stuff changes

berkeley-dsep-infra/datahub,ryanlovett/datahub,ryanlovett/datahub,berkeley-dsep-infra/datahub,ryanlovett/datahub,berkeley-dsep-infra/datahub