RDFa Entity Reference

Moves RDFa property from the field (wrapper) to be available and finally added to the actual rendered referenced entity. Working on use case such as: https://www.drupal.org/node/2052355
Also handles single/multiple field items.

Without (simplified output):-

<div class="field field-name-field-entityreference-instance field-type-entityreference">
  <div class="field-items">
    <div class="field-item" property="schema:location">
      <div class="entity entity-location location-location clearfix" typeof="schema:Place">

[rendered entity 0]

      </div>
    </div>
    <div class="field-item" property="schema:location">
      <div class="entity entity-location" typeof="schema:Place">

[rendered entity 1]

      </div>
    </div>
  </div>
</div>

With:-

<div class="field field-name-field-entityreference-instance field-type-entityreference">
  <div class="field-items">
    <div class="field-item">
      <div class="entity entity-location" typeof="schema:Place" property="schema:location" inlist="">

[rendered entity 0]

      </div>
    </div>
    <div class="field-item">
      <div class="entity entity-location" typeof="schema:Place" property="schema:location" inlist="">

[rendered entity 2]

      </div>
    </div>
  </div>
</div>