Google Traffic layer overlays itinerary Polyline

[fmsouza]

Google's traffic layer is always over the itinerary Polyline in Google Maps Android API v2. It's a know bug and still without solution since 2014.

Reference: https://code.google.com/p/gmaps-api-issues/issues/detail?id=6468

[georgerappel]

So there's apparently no way to show both traffic and the itinerary without overlay. We should add a configuration option to turn on/off the traffic. For now, we could merge this issue to the configurations enhancements #56 .