title: rbenv not switching Ruby versions correctly
body: <p>After following the setup described on the Github page for <code>rbenv</code> and running the <code>rbenv global 1.9.2-p290</code> command, <code>ruby -v</code> still outputs 1.8.7. When I try and run bundle, it errors because of the new Ruby 1.9 hash syntax, so I know that it is still running with Ruby 1.8.</p>
  
  <p>I ran into this problem following the Vagrant Railscast. So this is in a Vagrant virtual box as in the episode.</p>