Classes, all the way down (getting media template classes working)

Coming off of this issue #1375998: Getting custom classes to work I was fixing my templates.

I have a node and a media field that use the same layout. The content type's ouput includes the template class (screenshot), but the media field does not (screenshot).

Example output (notice how panel-1col is only included in the node and not in the field)

<div class="panel-display panel-1col clearfix  test-class">
	<div class="panel-panel panel-col">
		<div>
		<div class="panel-pane pane-entity-field pane-node-field-image">
		<div class="pane-content">
		<div class="field field-name-field-image">
		<div id="file-15" class="file file-image file-image-jpeg contextual-links-region">
		<div class="content">
		<img typeof="foaf:Image" src="http://localhost/...test.jpg" width="480" height="333" alt="">
		<div class="field field-name-field-caption">Test</div>
		<div class="field field-name-field-credit">
			<a href="http://www.test.com">Test</a>
		</div>
		</div>
		</div>
		</div> 
		</div>
		</div>
		</div>
	</div>
</div>