Add structural HTML to output

[Erin Bell]

This will be helpful for theme designers, etc.

Example...

<div class="cdm_container">
    <img src="...">
    <div class="cdm_title"><a href="...">...</a></div>
    <div class="cdm_description">...</div>
</div>

[Erin Bell]

Fixed by https://bitbucket.org/ohiohistoryconnection/contentdm-search/commits/b5aecbf6e050b2a93b780162bc460c6c77fefc1e