mapbox fails to render unless mapstyle attribute is removed

[mrmattwright]

Firstly thanks for open sourcing this! I'm a data scientist and a dad moving to wellington after some time overseas so this is an excellent and hugely helpful piece of work!

in map.js unless you remove

mapStyle="mapbox://styles/nzherald/ckbvt9no60gvk1ipone676rf6"

Then the map will not render. I have it working, but without styles. (actually looks ok!) just wondering if you are allowed to open source that file or set of styles?

I will publish the app on Heroku or similar....just doing a bit of reformatting as it doesn't need to fit in an article.

Great work, thanks for putting this together @vizowl