admin settings color pickers for highlighter

git-svn-id: https://plugins.svn.wordpress.org/smart-search/trunk@972700 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme typo

git-svn-id: https://plugins.svn.wordpress.org/smart-search/trunk@972701 b8457f37-d9ea-0310-8a92-e5e31aec5664