[GraphHopper] Tunnels and elevation/connectivity

[D KING]

I was messing around with the web mapping demo, and found this situation, which seems to be an error where a cycling route (inadvisably sent via a tunnel) abruptly 'leaps' to the surface and follows a track mid-way through the tunnel.

Not entirely sure that this is an error, but it does appear to be. (It was more obviously 'odd' when viewed as part of a longer route with an uncommonly steep 'step' ~ within a shorter segment it appears to mask the height change in the elevation graph more).

http://graphhopper.com/maps/?point=47.179329%2C11.870298&point=47.161824%2C11.932611&vehicle=bike&elevation=true

Driving continues correctly through the tunnel all the way, but walking also "exits" at the crossing of the surface path.
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