title: Bundle not using rbenv version
body: <p>I'm trying to bundle using rbenv. When I check the ruby version it gives me 2.4.0, rbenv. But when calling bundle it's using the default installed osx version.</p>
  
  <pre><code>MacBook-Pro-256:kittens-or-puppies antarrbyrd$ bundle
  Your Ruby version is 2.0.0, but your Gemfile specified 2.4.0
  MacBook-Pro-256:kittens-or-puppies antarrbyrd$ ruby -v
  ruby 2.4.0p0 (2016-12-24 revision 57164) [x86_64-darwin16]
  </code></pre>