Load maps also on page

git-svn-id: https://plugins.svn.wordpress.org/yandex-maps-api/trunk@860920 b8457f37-d9ea-0310-8a92-e5e31aec5664
optimization of code

git-svn-id: https://plugins.svn.wordpress.org/yandex-maps-api/trunk@860937 b8457f37-d9ea-0310-8a92-e5e31aec5664