Fix template order bug with markdown

markdown was turning quotes into &quot; causeing hndlebars parsing
errors. Do the pre template plugin before markdown. Order is important.
Add a file include helper
Add about page
Add badges page
Add RSS feed
Add RSS Feed
Add 404 page
Place arcive lists into panel
Add disqus support
Add humans.txt
Add SafeString to activeclassfor
Add includeMarkdownFile helper
Fix styles for pager buttons
Remove disqus from non comment pages
Use forked version of metalsmith-tags

Includes patch to add tags to metadata.
Add projects page
Clean link styles
Add search form to navbar