Compatibility release for WordPress 3.9

git-svn-id: https://plugins.svn.wordpress.org/sliding-widgets/trunk@977255 b8457f37-d9ea-0310-8a92-e5e31aec5664
LiveForm Image update

git-svn-id: https://plugins.svn.wordpress.org/sliding-widgets/trunk@977260 b8457f37-d9ea-0310-8a92-e5e31aec5664
Delete wpmp.png

git-svn-id: https://plugins.svn.wordpress.org/sliding-widgets/trunk@977262 b8457f37-d9ea-0310-8a92-e5e31aec5664