[GraphHopper] Inspect graph properties

[Emux]

I opened issue 285 
<https://github.com/graphhopper/graphhopper/issues/285> and wrote also 
about the loading errors in case of invalid initialization.

-- 
Emux
Cruiser <http://wiki.openstreetmap.org/wiki/Cruiser> - Atlas 
<http://wiki.openstreetmap.org/wiki/Atlas_%28navigation_application%29>
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