move screenshots to assets

git-svn-id: https://plugins.svn.wordpress.org/comprehensive-google-map-plugin/trunk@985631 b8457f37-d9ea-0310-8a92-e5e31aec5664
change contributors

git-svn-id: https://plugins.svn.wordpress.org/comprehensive-google-map-plugin/trunk@985633 b8457f37-d9ea-0310-8a92-e5e31aec5664
change contributors

git-svn-id: https://plugins.svn.wordpress.org/comprehensive-google-map-plugin/trunk@985635 b8457f37-d9ea-0310-8a92-e5e31aec5664