Added method for clearing album cache when widget updated.

git-svn-id: https://plugins.svn.wordpress.org/facebook-albums/trunk@802182 b8457f37-d9ea-0310-8a92-e5e31aec5664
Apply hook to clear an albums cache on save_post

git-svn-id: https://plugins.svn.wordpress.org/facebook-albums/trunk@802207 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fixed caching issues, Facebook auth should be resolved

git-svn-id: https://plugins.svn.wordpress.org/facebook-albums/trunk@802215 b8457f37-d9ea-0310-8a92-e5e31aec5664