memory cleanup

src/game-lib-system-particle.js

@@ -203,6 +203,9 @@ GameLib.System.Particle.prototype.beforeRender = function(data) {
                         particle.material.opacity < 0
                     ) {
                         particle.userData.scene.remove(particle);
+                        particle.geometry.dispose();
+                        //particle.material.map.dispose();
+                        particle.material.dispose();
                     } else {
                         result.push(particle);
                     }