Handling name differences

As reported in #24, we should try to return the same name for every geocoder.

> How do we handle the different name entry? E.g. we could parse "restaurant":"Sushi Oji" and use this as name but we would overwrite the full display name: "Sushi Oji, Prinzregentenstraße 122, 81677 München, Deutschland" and potentially break existing apps... hmmh

> Using different geocoders will give you different quality but the fields should be the same information. So if it is a POI the name field should contain just its name not the full address and if it is a street, then it could just contain the street name etc. having a field all_name or display_name with all information could be a nice addition though, which we would need for photon too then.