- fixed twitter user-names
- added GitHub links

git-svn-id: https://plugins.svn.wordpress.org/tweet-old-custom-post/trunk@1019047 b8457f37-d9ea-0310-8a92-e5e31aec5664
- added target _blank where needed

git-svn-id: https://plugins.svn.wordpress.org/tweet-old-custom-post/trunk@1019048 b8457f37-d9ea-0310-8a92-e5e31aec5664