add bookshelf icon

http://www.iconarchive.com/show/beautiful-flat-icons-by-elegantthemes/bo
okshelf-icon.html
SSLページにリダイレクトするミドルウェアを追加
add book models
add book rest api and rakuten books api
add requests at requirements.txt
rename sidebar menu
add template_script
update shopping page
update templates
update templates
update database
remove sidebar indices menu