Fix release

git-svn-id: https://plugins.svn.wordpress.org/gif-animation-preview/trunk@921269 b8457f37-d9ea-0310-8a92-e5e31aec5664
Add missing files

git-svn-id: https://plugins.svn.wordpress.org/gif-animation-preview/trunk@921270 b8457f37-d9ea-0310-8a92-e5e31aec5664