Change URL scheme to a single entry point system

Having a single domain as entry point to GDS has some advantages against a multi sub domain solution.
* Browser have to make less DNS request – faster page loads
* Nameserver have to manage fewer entries – less complexity

If your GDS is running distributed on multiple machines you can use Round-robin DNS and DDNS for load balancing or fault-tolerance.

It should also be noted that URLs are getting less important – http://www.allenpike.com/2014/burying-the-url/
Merge pull request #48 from JanSauer/urls

Change URL scheme to a single entry point system and add station domains