Testing some new colours / meme text style borders

[TheSkorm]

[argilo]

It looks like this change caused a bug: when a new time period is chosen in the drop-down menu, an exception occurs:

Uncaught TypeError: vehicle_info.prediction_polyline is null
    kill          http://localhost:8000/js/mobile.js?v=c82649b:8
    clean_refresh http://localhost:8000/js/mobile.js?v=c82649b:8
    onchange      http://localhost:8000/#!mt=Mapnik&mz=5&qm=3h&mc=53.46189,-2.21924:1

[argilo]

#339 should fix this.

[argilo]

Another bug that may have crept in with these changes: