Update 1 ready to be downloaded

Hi there !

In this update you will find :

• new backgrounds for the road tiles
• car physic improved
• 8 road tiles : 
  • left curve
  • right curve
  • simple bridge
  • simple bridge with wrecks and an ambulance
  • straight road with slalom part (win 5 sec on future timer)
  • straight road (base)
  • straight road with logs
  • straight road with a jump over fallen power poles (win 5 sec on future timer)
• no more possibilities to go off road and falling in the void, except from bridges
• new ambient skybox (night)
• car lights added :
  • brake light (on while brake)
  • head light (on/off with joybutton 4)
  • back light (always on)
  • rear light (not fully implemented)

To Do List :

• Game over (on time over) and back to menu (actually, you must quit the program with ALT+F4)
• Quit race and back to menu (same thing)
• rear lights
• rear gear / backward
• the race Timer (40 sec)
• Checkpoints (40 sec back - or more, what is better ?)
• 5 sec bonuses on slalom and jump
• back on road after falling, incindent, crash, blocked, or an on-demand key
• score on distance
• musics
• sounds
• keyboard controls
• new player cars