Helps to add a marker that follow the user on a map. Extends backbone.Event. This helper trigger an 'firstPositioning' event when the first location is found after tracking start with two parameters : the map and the new position
Set the tracker map
Parameters
map: Gmaps, Gmaps instance
Update the marker icon options
Parameters
iconOptions: Object, google.maps.marker options
Start showing the user position on the map.
Fires: event:firstPositioning When the first position is found
Stop showing the user position. Be careful, this does not stop tracking the geolocation.