1.7.3: update german trans; kml cache buster; filter flexmap_shortcode_script; bump version of Google Maps API to 3.15; CSS for API 3.15; CSS fix for directions markers; removed instructions page; no more visualrefresh

git-svn-id: https://plugins.svn.wordpress.org/wp-flexible-map/trunk@876086 b8457f37-d9ea-0310-8a92-e5e31aec5664