Uploading v2.1.5.

git-svn-id: http://plugins.svn.wordpress.org/google-calendar-events@1036473 b8457f37-d9ea-0310-8a92-e5e31aec5664
Tagging v2.1.5.

git-svn-id: http://plugins.svn.wordpress.org/google-calendar-events@1036475 b8457f37-d9ea-0310-8a92-e5e31aec5664