title: Can't install ffi gem, Rails fail
body: <p>While creating creating an integration test via <code>rails generate integration_test foo</code> it declined with</p>
  
  <pre><code>Could not find ffi-1.0.9 in any of the sources
  Run `bundle install` to install missing gems.
  </code></pre>
  
  <p>I ran <code>bundle install</code> to install missing gems, but with no success. Still the same error. I have <code>gem 'ffi'</code> in my Gemfile.</p>
  
  <p>I switched the gemfile line to <code>gem 'ffi', :git =&gt; 'git://github.com/ffi/ffi.git'</code> and <code>bundle install</code>ed again. It did all sort of stuff and wrote "Your bundle is complete" at the end.</p>
  
  <p>However when I run the <code>rails generate...</code> command again I get:</p>
  
  <p><code>git://github.com/ffi/ffi.git (at master) is not checked out. Please run 'bundle install'</code></p>
  
  <p>What the hell is going on with this ffi?</p>