Change train sound effects (split into multiple items so that they get loaded only once)
Merge branch 'master' of github.com:V-Play/AGJ13

* 'master' of github.com:V-Play/AGJ13:
  Update track graphics from nico.
  Rewrite obstacle creation: higher probability to create one, if there was a switch to the left. Even higher, if the switch was where the player is. On straigh pieces, probability is low because player can only honk to escape the cows then. Add to editableComponents for tweaking.
  add steam and snow. update handle image.
Merge branch 'master' of github.com:V-Play/AGJ13

* 'master' of github.com:V-Play/AGJ13:
  added both snow backgrounds
Add a background sound