Live Preview on Settins page

git-svn-id: https://plugins.svn.wordpress.org/lessbuttons/trunk@993288 b8457f37-d9ea-0310-8a92-e5e31aec5664
tagging version 1.4.0

git-svn-id: https://plugins.svn.wordpress.org/lessbuttons/trunk@993293 b8457f37-d9ea-0310-8a92-e5e31aec5664