Update FAQ

_posts/2013-07-16-faq.html

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+    <div class="question js-question">
+      <div class="question__inner">
+        <h3 class="question__text">What&rsquo;s the difference between Shuffle and Isotope?</h3>
+        <div class="question__answer">
+          <span>Isotope:</span>
+          <ul>
+            <li>more layout modes</li>
+            <li>more options</li>
+            <li>community of users</li>
+            <li>commercial use requires a license</li>
+          </ul>
+
+          <span>Shuffle:</span>
+          <ul>
+            <li>robust filtering</li>
+            <li>slightly smaller</li>
+            <li>responsive by default</li>
+            <li>sizer element (which <a href="http://packery.metafizzy.co/options.html#element-sizing">packery also has</a>)</li>
+          </ul>
+
+          <p>They are <em>very</em> similar, but I think Shuffle's filtering and sorting are easier to customize, which is the main reason I created this plugin. Isotope does have a much larger community, more tests, and more stackoverflow answers though.</p>
+        </div>
+      </div>
+    </div>
+
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