Add clear history and  Minor bug fixes

git-svn-id: https://plugins.svn.wordpress.org/jabze-chat/trunk@764543 b8457f37-d9ea-0310-8a92-e5e31aec5664
Add clear history and  Minor bug fixes

git-svn-id: https://plugins.svn.wordpress.org/jabze-chat/trunk@764544 b8457f37-d9ea-0310-8a92-e5e31aec5664