ADDED ENTRY-HEADER.PHP

there was already an ``entry-footer.php`` file so I added a
corresponding ``entry-header.php file``.
MINOR TWEAK
MORE SEMANTIC IMAGE POSES

Added HTML5 <figure> and <figcaption> to image posts
Also added captions, served up from Wordpress' media library
removed a presentational class from image

to do:
roll this out to the presence of other images elsewhere.
Merge pull request #18 from dylan-k/master

ADDED ENTRY-HEADER.PHP