Remove duplicate plugin banner image.

git-svn-id: http://plugins.svn.wordpress.org/google-calendar-events@977602 b8457f37-d9ea-0310-8a92-e5e31aec5664
Uploading v2.0.0-beta1.

git-svn-id: http://plugins.svn.wordpress.org/google-calendar-events@977605 b8457f37-d9ea-0310-8a92-e5e31aec5664
Created tag 2.0.0-beta1.

git-svn-id: http://plugins.svn.wordpress.org/google-calendar-events@977606 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updated plugin icons.

git-svn-id: http://plugins.svn.wordpress.org/google-calendar-events@980758 b8457f37-d9ea-0310-8a92-e5e31aec5664