Changed banner and name

git-svn-id: https://plugins.svn.wordpress.org/bolcom-seller-widget/trunk@774527 b8457f37-d9ea-0310-8a92-e5e31aec5664
moved banner to assets folder

git-svn-id: https://plugins.svn.wordpress.org/bolcom-seller-widget/trunk@774529 b8457f37-d9ea-0310-8a92-e5e31aec5664