fix inconsistencies with integer and iterator range header files, closes #1296
renamed:    Util/LuaUtil.h -> Util/lua_util.hpp
renamed:    DataStructures/RestrictionMap.cpp -> DataStructures/restriction_map.cpp
renamed:    DataStructures/RestrictionMap.h -> DataStructures/restriction_map.hpp
renamed:    DataStructures/SegmentInformation.h -> DataStructures/segment_information.hpp
renamed:    ../Benchmarks/StaticRTreeBench.cpp -> ../Benchmarks/static_rtree.cpp
renamed:    Contractor.h -> contractor.hpp