Update template engine to support <img/> elements

When add list items based on such template:
<ul id="properties-list" class="list">
  <li class="property_item">
    <img class="property_image" src="1.jpg" alt=""/>
    <h2 class="property_name">Hotel 1</h2>
    <span class="property_price">100$</span>
    <span class="property_location">Adventure Bay</span>
    <p class="property_description">Lorem ipsum...</p>
  </li>
</ul>
"property_image" value should became not elm.innerHTML but elm.src