make them non-final
add tests to VehicleRoutingProblem
add javadoc and tests
add javadoc to Vehicle and VehicleImpl
inspect and remove warnings
update
Merge branch 'master' of https://github.com/jsprit/jsprit

Conflicts:
	jsprit-core/src/main/java/jsprit/core/problem/vehicle/FiniteFleetManagerFactory.java
	jsprit-core/src/main/java/jsprit/core/problem/vehicle/InfiniteFleetManagerFactory.java