Fix: Error that caused pages to be slightly narrower than normal.

git-svn-id: https://plugins.svn.wordpress.org/styles-twentytwelve/trunk@794888 b8457f37-d9ea-0310-8a92-e5e31aec5664
Credit @wholthof in readme

git-svn-id: https://plugins.svn.wordpress.org/styles-twentytwelve/trunk@794891 b8457f37-d9ea-0310-8a92-e5e31aec5664