Search result not visible

[rkversion]

Search for "Albert Neuhuysstraat" in Amsterdam: after clicking on the relevant result link the
landing page includes the searched-for street, but the view is zoomed out too much so that
the street name is not visible, and it is impossible to find it, unless one knows the area well.

Landing page for the result should be at zoom level sufficient to easily see what was searched for.

[embeepea]

I think this is resolved now; see #37.

The initial implementation of the search box had the results zoom level hardcoded at 13.5. The PR above chooses a zoom level based on the bounding box of the search results returned from nominatim.