Add normalize.css v2.1.3 minified with clean-css.
Merge pull request #143 from XhmikosR/normalize.css

Add normalize.css v2.1.3 minified with clean-css.
normalize.min.css: Put back the license header.

It was accidentally removed.
Merge pull request #147 from XhmikosR/patch-1

normalize.min.css: Put back the license header.