[GraphHopper] Android: Unload graph

[emux]

The relevant issue is the 188 
<https://github.com/graphhopper/graphhopper/issues/188>.
The proper GH close seems to fix the memory issues at application exit.

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