Update File.hx

should fix image path for multi folder scml (had duplicate folder in path, example torso/torso/ for the following scml :  <folder id="0" name="torso"><file id="0" name="torso/p_torso_idle.png"...)
Update Scml.hx

Add function to change animation
Update Spriter.hx

Add function to change animation
Update MainScene.hx

we can change the animation in the demo with the space key now
Merge pull request #2 from loudoweb/master

fixed image path for multi folder scml and added animation handler