title: Suppress install outputs in R
body: <p>This is really starting to bug me...I have tried a few methods and none seem to work</p>
  
  <p>I am running an install from a function which generates a lot of unnecessary messages that I would like to suppress, but all of the methods I tried to do this have not worked.</p>
  
  <p>The bit of code I am trying to suppress is : <code>install_github('ROAUth', 'duncantl')</code>, it requires the package <code>devtools</code> to be loaded beforehand.</p>
  
  <p>Anyway, I tried <code>invisible</code>, <code>capture.output</code> and <code>sink</code>, none of which work...or perhaps I am not using them correctly... either way...any ideas?</p>