add import export csv and xls, show data table using query
orderチャート追加。jQueryエラー
require iconv 削除
navにtoggle追加
Merge branch 'feature/chart_graph' into develop
Merge branch 'feature/design' into develop

Conflicts:
	app/views/layouts/_navigation.html.erb
	log/development.log
	tmp/pids/server.pid
不要デザインの削除
Orderページのバグを修正
Merge pull request #1 from u651601f/develop

Develop