* Bugfix 1. Get lat and lng from Marker via correct API function.
* Bugfix 2. Toggle Show area on map button now works.
* Optimized init of map when many markers.

git-svn-id: https://plugins.svn.wordpress.org/advanced-custom-fields-multiple-coordinates/trunk@803457 b8457f37-d9ea-0310-8a92-e5e31aec5664