readme update

git-svn-id: https://plugins.svn.wordpress.org/slickquiz/trunk@867741 b8457f37-d9ea-0310-8a92-e5e31aec5664
fixes readme syntax issue, resolves options page apostrophe escaping bug; closes #25

git-svn-id: https://plugins.svn.wordpress.org/slickquiz/trunk@867743 b8457f37-d9ea-0310-8a92-e5e31aec5664
adds delete score option; adds ability to save user emails; closes #40, closes #17

git-svn-id: https://plugins.svn.wordpress.org/slickquiz/trunk@867745 b8457f37-d9ea-0310-8a92-e5e31aec5664