PR #13: Added .button-primary and .button-secondary classes to and removed &raquo's from buttons throughout the admin for consistency. Ref: https://github.com/Automattic/wp-super-cache/pull/13 Props: rcowles

git-svn-id: https://plugins.svn.wordpress.org/wp-super-cache/trunk@961053 b8457f37-d9ea-0310-8a92-e5e31aec5664