updates some bugs

git-svn-id: https://plugins.svn.wordpress.org/sp-header-image-slider/trunk@995207 b8457f37-d9ea-0310-8a92-e5e31aec5664
work with latest wordpress

git-svn-id: https://plugins.svn.wordpress.org/sp-header-image-slider/trunk@995210 b8457f37-d9ea-0310-8a92-e5e31aec5664