Bug: Icon instead of Icons

[kareljuricka]

Issue description
In google-map-types.d.ts - Interface PolylineOptions shoud contain icons?: Array;
instead of icon?: Array;

That ending 's' is important, see here - https://developers.google.com/maps/documentation/javascript/examples/overlay-symbol-dashed.

Current behavior
Its possible to use with ANY but Typescript strong typings can not be used.

Expected/desired behavior
Generate PolylineOptions with type PolylineOptions instead of ANY.

angular2 & angular-google-maps version
0.17.0

Other information
So only what have to be done is add that ending 's' to make it correct.

[sebholstein]

@kareljuricka Thx for the report. Do you have time to send a PR?