heroku
加入管理员页面，改变评论删除功能

管理员可查看用户，并删除评论，普通用户没有这个权利
admin
修改seeds
seeds
seeds
seed
heroku
Merge remote-tracking branch 'web/master'
delete
new
添加书籍
search
Merge remote-tracking branch 'web/master'
mailer and search
mailer and search
mailer and search
mailer and search
mailer and search
mailer and search