Version 4.4.2 release

git-svn-id: https://plugins.svn.wordpress.org/video-embed-thumbnail-generator/trunk@1018741 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updated readmes

git-svn-id: https://plugins.svn.wordpress.org/video-embed-thumbnail-generator/trunk@1018742 b8457f37-d9ea-0310-8a92-e5e31aec5664