いらないCSSを削除
デバッグ用のコードを削除
index.html と js/main.jp を統合
main.jsを削除
Merge branch 'issue-28'
issue 29
issue 29
Merge branch 'master' into issue-29

Conflicts:
	index.php
issue 29
Merge branch 'issue-29'
Merge branch 'master' into issue-37
issue-37 fixed
Merge branch 'issue-37'