Display blog posts.

You can now click on a post on the home page and view the post in its own page.

- Implemented permalinks.

Links:
- How can I allow slashes in my Express routes? http://stackoverflow.com/q/14915496/8446
Added link rel=canonical to home page and article pages.

Links:
- http://support.google.com/webmasters/bin/answer.py?hl=en&answer=139394