title: Is there a way to install local packages in packrat without downloading from GitHub?
body: <p>I am using packrat in an R project, and it is rather laborious to add functions to my custom package, rebuild, push to GitHub, and then re-download the package from GitHub into packrat. Besides taking a lot of extra time this involves pushing my new functions to the master, which is not ideal when I'm still iterating on new functions. </p>
  
  <p>If I were not using packrat I could just rebuild the package locally, restart R and  the updated version of the package would be accessible.</p>
  
  <p>Is there a way to speed up this workflow and still use packrat?  </p>