changed default traversal mode if at least one turncosts=true is specified
as we introduced a new weighting and #281 we needed to increase the edge version
minor removal of deprecated stuff
added recommendations to traversal modes
trying to fix #217, Loading routing information from a read only file system
trying to fix #283, Work around System.gc() calls for mobile
Merge branch 'master' of https://github.com/graphhopper/graphhopper