update uploadcare plugin to version 2.0.11

git-svn-id: https://plugins.svn.wordpress.org/uploadcare/trunk@862283 b8457f37-d9ea-0310-8a92-e5e31aec5664
delete unused stuff

git-svn-id: https://plugins.svn.wordpress.org/uploadcare/trunk@862286 b8457f37-d9ea-0310-8a92-e5e31aec5664
remove 'featured images' add 'shortcode' to readme.txt

git-svn-id: https://plugins.svn.wordpress.org/uploadcare/trunk@862291 b8457f37-d9ea-0310-8a92-e5e31aec5664