Add v1.0.2 of normalize.css
Add TweetDeck and Guardian to list of users
Add Soundcloud to list; minor adjustments

Other changes are: linking to `m.guardian.co.uk` rather than the Guardian
framework on GitHub; and updating the wording of the credits.
Make footer slightly wider
Add Medium to list of sites using normalize.css
Add links to CHANGELOGs
Add link to GitHub repo in description
Add v1.1.0 of normalize.css
Add v2.1.0 of normalize.css