title: Cannot use RVM-installed Ruby with sudo
body: <p>I have succefully configured RVM to use Ruby 1.9.2 and everything is fine. However when I'm trying to run Ruby using <code>sudo</code> it says it cannot find RVM or Ruby:</p>
  
  <pre><code>$ ruby -v
  ruby 1.9.2p0 (2010-08-18 revision 29036) [x86_64-linux]
  
  $ sudo ruby -v
  [sudo] password for administrator:
  sudo: ruby: command not found
  </code></pre>
  
  <p>Is that correct behavior or is my RVM misconfigured? Perhaps I should be using the <a href="http://rvm.beginrescueend.com/deployment/system-wide/" rel="noreferrer">system wide install</a>?</p>