Remove no longer used files

git-svn-id: https://plugins.svn.wordpress.org/backupwordpress/trunk@1025710 b8457f37-d9ea-0310-8a92-e5e31aec5664
remove ecolorbox

git-svn-id: https://plugins.svn.wordpress.org/backupwordpress/trunk@1025712 b8457f37-d9ea-0310-8a92-e5e31aec5664
remove unneeded files

git-svn-id: https://plugins.svn.wordpress.org/backupwordpress/trunk@1025715 b8457f37-d9ea-0310-8a92-e5e31aec5664