Release 2.2.1

git-svn-id: https://plugins.svn.wordpress.org/oauth-twitter-feed-for-developers/trunk@860384 b8457f37-d9ea-0310-8a92-e5e31aec5664
Update version number in the 20th place we're supposed to to be able to release

git-svn-id: https://plugins.svn.wordpress.org/oauth-twitter-feed-for-developers/trunk@860388 b8457f37-d9ea-0310-8a92-e5e31aec5664