Return full Post objects from `latest_posts`.
Return a real Date object from Post#date.
Lazily generate formatted post date and content.

The archive doesn't need content at all and
the feed only needs content for recent posts.
Add Atom feed.
Merge branch 'feed' of github.com:jasoncodes/lindseybieda-blog

Conflicts:
	Gemfile.lock
	blog.rb
Changing the url so if anyone subbed with my version of the code it doesn't 404. :)