[GraphHopper] Call load error

[Emux]

- It's recommended to use the same GraphHopper version for graph 
creation and graph read
- After graph creation check to see if it is indeed has been created 
correctly, i.e. not 0 size files
- When you use some options for the graph creation (e.g. contraction 
hierarchies on) you need to use the same options for the read

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