title: OpenCPU how to install a package in R/pub?
body: <p>I'm unclear about how to install an R package under R/pub in openCPU on my own openCPU server. The openCPU documentation states that package installation is handled by the administrator, but does not give any instructions (that I can find) concerning package installation. </p>
  
  <p>I'm sure I'm missing something obvious but any help with this would be appreciated. </p>
  
  <p>FWIW, I'm attempting to install the ''markdown'' package, which for some reason wasn't installed when calling <code>opencpu-cran</code>.</p>
  
  <hr>
  
  <p><strong>UPDATE:</strong>
  I found <a href="http://public.opencpu.org/userapps/jun9/opencpu.demo/admin/" rel="nofollow noreferrer">this link</a> to an example. It calls to the following URL <code>"/Radmin/call/opencpu.demo/install.opencpu/json"</code>, but that approach appears not to work based on <a href="https://stackoverflow.com/questions/11836966/opencpu-admin-opencpu-demo">this SO question</a>. So, if that's not the way to install packages via openCPU, how is it done?</p>