the logo should default to logo.png, not securedrop.png
improved global header and link styles, and reformatted css syntax to be consistent
minor css tweaks to source interface
added breadcrumbs to col
updated font-awesome
made source listing page look way better
mdae quick filter box look better
improved col page
fixes test_filenames and test_filenames_delete
fixed test_submit_file
Merge branch 'beauty' of https://github.com/micahflee/securedrop into micahflee-beauty

Conflicts:
	securedrop/static/css/styles.css
remove unnecessary margin below notification
date formatting should be in the template