Place road casings below all roads

[Edefritz]

Prevents "bridge" like rendering effect of regular intersections.

See #42

Now I'm not 100% sure this is the correct approach. Maybe there is something else I didn't consider so someone should definitely double check for other cases.
But simply moving the casings for all four road types above the first rendered road type seems to address the issue and produces the desired outcome.

OSM

Before PR

After PR

[nvkelso]

+1 to this general approach. I'll followup with a code review soon.

[Edefritz]

Thanks! :) I just noticed the diffs might look a bit confusing. The only thing I did was moving the road casing layers up in the rendering order. Git makes it seems as if I changed individual properties of some existing layers.

[bdon]

Thanks! Looks like we need to do the same for tunnels and bridges (all casings for all classes instead before strokes)

[Edefritz]

Thanks again for looking into this. I guess now that the changes were merged, it would also make sense to increment the version of the npm package to 1.3.1?
The last release of that package was 5 months ago.