Added collisions with objects on scene

Player will now be stopped by fences
Also added the possibility to define the size of ground
Also edited speed of animations
Also optimized the loading of fences

src/main.js

@@ -38,7 +38,7 @@ Animations.addAnimationMixerOnMesh(assets.player, ["Walk"]);
 function animate() {
 	requestAnimationFrame( animate );
 
-  PlayerMovement.updatePlayerPositionAnimation(assets.player, camera);//Updating player position and rotation
+  PlayerMovement.updatePlayerPositionAnimation(assets.player, camera, scene);//Updating player position and rotation
   Animations.updateAnimations(Clock.getDelta());//Playing animations
 
 	renderer.render( scene, camera );//Calculating and redering new frame