TutorialScene を追加した
Create Tutorial Scene that show story & howto play.

To share constants of stamina gauge, move macro to constants from ScoreBoard.
Update spriteSheet.
Show tutorial if its first play.

Add story menu on Title.
Update tutorial layout, after review.
move tutorial menu item to join startmenu group.
Merge branch 'master' into tutorial
Update message from request.
Change macro key of tutorial menu on title.

remove default title from tutorial scene.
Merge pull request #19 from ichiko/tutorial

チュートリアルを追加した