Add support for short-linking _posts

This involves creating a separate (non-versioned) _pages directory
that contains symlinks to posts without the date prefix.
2013-06-03-some-post-name.md => some-post-name.md

This is purely for convenience while opening and editing the posts
Add footer for spacing and finality
code/pre font-size fix, body font-weight increase
Merge branch 'master' into gh-pages