title: in foundation 5 when I change the ranges in settings it does not work
body: <p>I use these in my settings</p>
  
  <pre class="lang-css prettyprint-override"><code>$small-range: (0em, 31em); /* 0, 640px */
  $medium-range: (31.063em, 64em); /* 641px, 1024px */
  $large-range: (64.063em, 90em); /* 1025px, 1440px */
  $xlarge-range: (90.063em, 120em); /* 1441px, 1920px */
  $xxlarge-range: (120.063em); /* 1921px */
  </code></pre>
  
  <p>All other settings compile correctly.
  The above ones are simply ignored</p>