Incorporate WordPress 3.6 Post Format UI and Template Tags

[chipbennett]

WordPress 3.6 includes new template tags, such as the_video() and the_image(), to fetch post-format specific post content media. Incorporate these functions where appropriate.

Also, ensure post-format post loop accommodates data conventions for post format content as defined in WordPress 3.6.

[chipbennett]

Moved to "future", since these features have been removed from WordPress 3.6.