Add: ESC key back(), Enter key start/restart to all features

src/game/mouse/space_invaders/game.js

@@ -10,12 +10,18 @@ var Game = {
 			(function() { this.gameOver(); }).bind(this)
 		);
 
+		// keyboard shortcut
+		this.keyboardShortcut = new KeyboardShortcut();
+		this.keyboardShortcut.addCallback(
+			Phaser.KeyCode.ESC,	// keyCode
+			null,	// keyDownHandler
+			(function() { this.back(); }).bind(this),	// keyUpHandler
+			"space invaders"	// callerClassName
+		);
+
 		// top ui
 		var screenTopUI = new ScreenTopUI();
-		screenTopUI.makeBackButton( function() {
-			sessionStorageManager.resetPlayingAppData();
-			location.href = '../../web/client/menu_app.html';
-		});
+		screenTopUI.makeBackButton( (function() { this.back(); }).bind(this) );
 		screenTopUI.makeFullScreenButton();
 
 		var scoreBoard = new ScoreBoard();
@@ -83,6 +89,12 @@ var Game = {
 		// this.countDown();
 	},
 
+
+	back: function() {
+		sessionStorageManager.resetPlayingAppData();
+		location.href = '../../web/client/menu_app.html';
+	},
+
 	initListeners: function() {
 	},