title: Rails : bundle install nokogiri fail
body: <p>When I run > bundle install</p>
  
  <pre><code>`An error occurred while installing nokogiri (1.6.2.1), and Bundler cannot continue.
  Make sure that `gem install nokogiri -v '1.6.2.1'` succeeds before bundling.
  </code></pre>
  
  <p>Ok, so I run  > sudo gem install nokogiri -v '1.6.2.1'</p>
  
  <p>I have this : </p>
  
  <pre><code>    Gem files will remain installed in /Library/Ruby/Gems/2.0.0/gems/nokogiri-1.6.2.1 for inspection.
  Results logged to /Library/Ruby/Gems/2.0.0/gems/nokogiri-1.6.2.1/ext/nokogiri/gem_make.out
  </code></pre>
  
  <p>When I run the command : rails g controller...</p>
  
  <pre><code>Could not find gem 'rspec-rails (= 2.13.1) ruby' in the gems available on this machine.
  Run `bundle install` to install missing gems.
  </code></pre>
  
  <p>Please help me!</p>