title: Hosted continuous integration for R?
body: <p>I have looked at some hosted CI providers, but no one promised to actually support R out of the box. Ideally, one could specify different versions of R to test the code with. I'm interested in the automatic testing and building of open-source R packages.</p>
  
  <p>So: If there is such a provider with good support for R -- where? If not, with which provider will the setup be least painless?</p>