readme update

git-svn-id: https://plugins.svn.wordpress.org/slickquiz/trunk@874410 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@874411 b8457f37-d9ea-0310-8a92-e5e31aec5664
resolving share copy issue, closes #43

git-svn-id: https://plugins.svn.wordpress.org/slickquiz/trunk@874412 b8457f37-d9ea-0310-8a92-e5e31aec5664