Factored some massive bits of logic from single_post.html in to smaller includes
Added explicit reference to favicon.png in head
Updated urls to feed.xml and feed.json to use site.BASE_PATH
Factored navbar out in to include
Added some styles for a new header when not in blog posts (may change this later!)
Factored archive.html logic out to an include
Changed format of index to show just a preview of latest post, and list some more recent posts
_config.yml jekyll flags updated