Update stylesheet to include proper copyright and license attribution in style.css. Fixes #10 and also reverts the changes that were made in 06463db11dd44908c9ba2d5aef2ea70a97e142f7, since we can now use this copyright notice to find out which themes are based on Underscores.
Update stylesheet to include proper copyright and license attribution in style.css. Fixes #10 and also reverts the changes that were made in 06463db11dd44908c9ba2d5aef2ea70a97e142f7, since we can now use this copyright notice to find out which themes are based on Underscores.

madeso-uk/vcsassist,andbaz/launchbaz,vaishaliagola27/_s,carl-alberto/business-portfolio,solidusjs/wp-solidus,vaishaliagola27/_s,jchck/jchck_,andbaz/launchbaz,carl-alberto/business-portfolio,madeso-uk/vcsassist,vaishaliagola27/_s,SparkartGroupInc/nadando,jchck/jchck_