Added the velocity profile classes to the library.

src/CMakeLists.txt

 # driver source files
 #SET(sources gradient.cpp g2_spline.cpp dijkstra.cpp opendrive_geometry.cpp opendrive_common.cpp opendrive_line.cpp opendrive_spiral.cpp opendrive_arc.cpp opendrive_param_poly3.cpp opendrive_signal.cpp opendrive_object.cpp opendrive_road.cpp opendrive_road_segment.cpp opendrive_lane.cpp opendrive_road_node.cpp opendrive_link.cpp opendrive_junction.cpp vel_profile.cpp vel_spline.cpp vel_trapezoid.cpp osm/osm_map.cpp osm/osm_node.cpp osm/osm_way.cpp osm/osm_junction.cpp osm/osm_road_segment.cpp osm/osm_restriction.cpp)
-SET(sources gradient.cpp g2_spline.cpp dijkstra.cpp common.cpp road.cpp junction.cpp road_segment.cpp road_map.cpp)
+SET(sources gradient.cpp g2_spline.cpp dijkstra.cpp common.cpp road.cpp junction.cpp road_segment.cpp road_map.cpp vel_profile.cpp vel_spline.cpp vel_trapezoid.cpp)
 SET(opendrive_sources opendrive/opendrive_geometry.cpp opendrive/opendrive_line.cpp opendrive/opendrive_spiral.cpp opendrive/opendrive_arc.cpp opendrive/opendrive_param_poly3.cpp opendrive/opendrive_signal.cpp opendrive/opendrive_object.cpp opendrive/opendrive_road_segment.cpp opendrive/opendrive_lane.cpp opendrive/opendrive_junction.cpp)
 
 # application header files
 #SET(headers ../include/gradient.h ../include/g2_spline.h ../include/dijkstra.h ../include/opendrive_common.h ../include/opendrive_geometry.h ../include/opendrive_line.h ../include/opendrive_spiral.h ../include/opendrive_arc.h ../include/opendrive_param_poly3.h ../include/opendrive_signal.h ../include/opendrive_object.h ../include/opendrive_road.h ../include/opendrive_road_segment.h ../include/opendrive_lane.h ../include/opendrive_road_node.h ../include/opendrive_link.h ../include/opendrive_junction.h ../include/vel_profile.h ../include/vel_spline.h ../include/vel_trapezoid.h ../include/osm/osm_map.h ../include/osm/osm_node.h ../include/osm/osm_way.h ../include/osm/osm_junction.h ../include/osm/osm_road_segment.h ../include/osm/osm_restriction.h) 
-SET(headers ../include/gradient.h ../include/g2_spline.h ../include/dijkstra.h ../include/common.h ../include/road.h ../include/junction.h ../include/road_segment.h ../include/road_map.h)
+SET(headers ../include/gradient.h ../include/g2_spline.h ../include/dijkstra.h ../include/common.h ../include/road.h ../include/junction.h ../include/road_segment.h ../include/road_map.h ../include/vel_profile.h ../include/vel_spline.h ../include/vel_trapezoid.h)
 SET(opendrive_headers ../include/opendrive/opendrive_common.h ../include/opendrive/opendrive_geometry.h ../include/opendrive/opendrive_line.h ../include/opendrive/opendrive_spiral.h ../include/opendrive/opendrive_arc.h ../include/opendrive/opendrive_param_poly3.h ../include/opendrive/opendrive_signal.h ../include/opendrive/opendrive_object.h ../include/opendrive/opendrive_road_segment.h ../include/opendrive/opendrive_lane.h ../include/opendrive/opendrive_junction.h) 
 
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/libosmium")