refactor and add the ability to inject custom code

src/templates/components/select.mustache

@@ -2,7 +2,7 @@
   <span class="label">{{label}}</span>
   <select data-manipulator-target class="item-select">
     {{#options}}
-      <option value="{{value}}" {{selected}} class="item-select-option">{{&label}}</option>
+      <option value="{{value}}" class="item-select-option">{{&label}}</option>
     {{/options}}
   </select>
 </label>