Change the timeout to 1800 seconds

Signed-off-by: Maximilian Güntner <maximilian.guentner@gmail.com>
Added osm-bright from Mapbox

The osm-carto style is now available at http://host/osm/0/0/0.png
while osm-bright is at http://host/osmb/0/0/0.png

node-millstone is a new dependecy for osm-bright

Currently node-millstone downloads the 10m-populated-places-simple
shapefile which should be done in the Dockerfile (see issue #1).

Signed-off-by: Maximilian Güntner <maximilian.guentner@gmail.com>