Added option to share remote preview URL. (ngrok)

layouts/partials/toolbar.hbs

@@ -9,6 +9,9 @@
   </div>
 
   <div class="page_toolbar__right">
+    {{#if shareUrl}}
+      <a href="{{ shareUrl }}" target="_blank" class="share" title="Share URL"></a>
+    {{/if}}
     {{#if config.styleGuideUrl}}
       <a href="{{ config.styleGuideUrl }}" target="_blank" class="palette" title="Open Style Guide"></a>
     {{/if}}