prepare v9.1.2

git-svn-id: https://plugins.svn.wordpress.org/comprehensive-google-map-plugin/trunk@1004023 b8457f37-d9ea-0310-8a92-e5e31aec5664
change stable tag to v9.1.2

git-svn-id: https://plugins.svn.wordpress.org/comprehensive-google-map-plugin/trunk@1004026 b8457f37-d9ea-0310-8a92-e5e31aec5664