neighbor updates 50%; periodic updates 15%3; lazy updates for last 10%
fixed failing prepare tests
merged fix for world wild preparation:less lazy updates; now log periodic, lazy and neighbor updates
added contributing file to be displayed before creating a new issue
fix version + print on import
fixing #42
minor fix in script if osm_xml is dir; and fix if running integr test
fixed integration test; no agriculture for CAR
decreasing neighbor updates to make last step faster
minor naming fix
fixed ugly prepare test, still keep them to see if shortcuts creation diverges a lot or not
further integration test fix as more access restrictions
minor fix to stopwatches
make preparation configurable
log config as well
Merge remote-tracking branch 'upstream/master'

Conflicts:
	core/src/main/java/com/graphhopper/reader/OSMReader.java
	core/src/main/java/com/graphhopper/routing/ch/PrepareContractionHierarchies.java