Fix new api key requirement of google

[jalbstmeijer]

Hi,

It seems you now need to use a key to connect to the google api, please make this key configurable in a config file.
For now a hard coded fix in displaymap.php;

• <script src="//maps.google.com/maps/api/js?v=3&sensor=false&libraries=adsense"></script>

• <script src="//maps.google.com/maps/api/js?v=3&sensor=false&key=_SECRET_KEY_HERE_&libraries=adsense"></script>

G, J

[nickfox]

You are welcome to do a pull request.

n