Import a stable version of html5shiv

Extended rationale:
http://zoompf.com/blog/2012/05/html5shiv-and-serving-content-from-code-repositories
OCD: spacing
Merge pull request #3 from pwnall/patch-1

fix spacing in css
Merge pull request #2 from pwnall/master

import stable version of html5shiv
Merge remote-tracking branch 'upstream/master'
Cleaned up code. Changed long_title to window_title. Changed description to tagline.