Added feed.xml and appropriate templates.

feed.xml from: https://github.com/snaptortoise/jekyll-rss-feeds
various utility CSS classes (pull-right, link hover)
Added Email, Twitter and RSS icons to main page
Wrap article text in <article> to enable Safari Reader etc.
Added complete bibliography listing via Jekyll-Scholar

Bibliography.bib is exported from Papers for Mac (Export > Bibtex)
	w/ the "Complete" option.