GeoPoint Support

Because we would love to see GeoPoint Support in the original plugin i re-forked the plugin from https://github.com/datingcafe/elasticsearch-gorm-plugin and merged the latest fixes / changes into it. At issue #9 you requested a pull request, so this is a try ;)... There is still the hibernate depency in there used for unit and integration tests. Maybe you can take a look. I have no idea what i can do to remove that depency without removing the tests.. if it helps i can create a pull request without tests, so without the hibernate depency