Added unit and functional tests.

git-svn-id: https://plugins.svn.wordpress.org/adplugg/trunk@1025360 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fixed link to widgets from options page.

git-svn-id: https://plugins.svn.wordpress.org/adplugg/trunk@1025361 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fixed PHP strict standards issues

git-svn-id: https://plugins.svn.wordpress.org/adplugg/trunk@1025362 b8457f37-d9ea-0310-8a92-e5e31aec5664
Fixed PHP strict standards issues (cont'd)

git-svn-id: https://plugins.svn.wordpress.org/adplugg/trunk@1025363 b8457f37-d9ea-0310-8a92-e5e31aec5664