UI changes and some structural improvements

Made modifications to the template files and added files to sitemedia.
Updated form view
Changes to search.html and ddi-serach dev req

Added markup to search
Removed My SQL req for dev
added preview panel to results
Merge branch 'develop' of https://github.com/emory-libraries/ddi-search into develop

Conflicts:
	ddisearch/ddi/templates/ddi/search.html
	pip-dev-req.txt
	templates/site_base.html