title: Rails4 Foundation4 undefined mixin
body: <p>I can't use mixins of Foundation in my rails app (error: Undefined mixin 'column').</p>
  
  <p>Gemfile</p>
  
  <pre><code>    gem 'rails', '~&gt; 4.0.0'
      gem 'sass-rails'
      gem 'zurb-foundation'
  </code></pre>
  
  <p>Application.css.scss</p>
  
  <pre><code>    /*
      *= require_self
      *= require foundation_and_overrides
      *= require_tree .
      */
  </code></pre>
  
  <p>layout.css.scss</p>
  
  <pre><code>    section {
        @include column(12);
      }
  
      aside {
        @include column(4);
      }
  </code></pre>
  
  <p>And there it does not find the mixin.
  I've also looked at <a href="https://github.com/zurb/foundation/issues/1230" rel="nofollow">https://github.com/zurb/foundation/issues/1230</a>
  and <a href="https://github.com/zurb/foundation/issues/2128" rel="nofollow">https://github.com/zurb/foundation/issues/2128</a> but none of them seemed to work.</p>