add a test file which change backgroud by var
add a var-imageUrl but I am not sure wether it works
place simulation web at left
delete world->Update(),add Fl::wait()
correct the car's position , work perfect when use relative
Merge branch 'urlPassMap' into simulationWebAppearSameTime

merge branch-urlPassMap
add urlPassMap
add some pictures *.cfg *.world
add link build
delete the simulation of stage , only left web to work