update style adding important to buttons

git-svn-id: https://plugins.svn.wordpress.org/skedmaker-online-scheduling/trunk@1018937 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme

git-svn-id: https://plugins.svn.wordpress.org/skedmaker-online-scheduling/trunk@1018939 b8457f37-d9ea-0310-8a92-e5e31aec5664