Demo missing Google API key

[chdsbd]

Setting the starting location doesn't appear to work at https://transit.geotrellis.io/travelshed.html.

The console displays the error message: Google Maps API warning: NoApiKeys https://developers.google.com/maps/documentation/javascript/error-messages#no-api-keys

[rossbernet]

Thanks for bringing this to our attention, we'll look into it.