v0.6.2e: fixed bad changes made to app lifecycle managment

SPD-classes/src/main/java/com/watabou/noosa/Scene.java

@@ -52,10 +52,14 @@ public class Scene extends Group {
 		super.destroy();
 	}
 	
-	public void onFocusLost() {
+	public void onPause() {
 		
 	}
 	
+	public void onResume(){
+	
+	}
+	
 	@Override
 	public void update() {
 		super.update();
@@ -67,7 +71,7 @@ public class Scene extends Group {
 	}
 	
 	protected void onBackPressed() {
-		Game.quitGame();
+		Game.instance.finish();
 	}
 	
 	protected void onMenuPressed() {