Made things backward compatiable to version 3.3.1

git-svn-id: https://plugins.svn.wordpress.org/simple-links/trunk@840360 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fixing backward compatibility issue

git-svn-id: https://plugins.svn.wordpress.org/simple-links/trunk@840362 b8457f37-d9ea-0310-8a92-e5e31aec5664