Add support for inline styles

[snout1979]

Inline styles can be useful when you want to change only a little bit about a default map style, e.g. by merely removing clickable POI's from the map.

Include in the map options

styles => $style

where $style is the JSON array containing your inline style, e.g.

$style='[{ featureType: "poi", elementType: "labels", stylers: [ { visibility: "off" } ] }];';