Changed google URLs starting with a hard coded http: to begin with // instead.
This way the protocol is dynamically chosen depending on the protocol of the site (http or https).
See RFC1808 and stackoverflow.com/questions/6785442/browser-support-for-urls-beginning-with-double-slash
Otherwise some browsers (like Chrome) would deny loading the map via http if the site itself uses https.
Merge pull request #9 from iimog/master

Changed google URLs starting with a hard coded http: to begin with // instead.