refs #TaskShowAllBookUser
Show all books in admin
refs #TaskShowAllBookUser
Merge pull request #13 from ducnhat1989/showallbooks

Show all books in admin
Merge pull request #14 from HaChan/taskShowAllBookUser

Task show all book user
refs #TaskShowBookUser
Merge pull request #16 from HaChan/taskShowBook

refs #TaskShowBookUser
Add a new book
Merge pull request #15 from ducnhat1989/AddNewBook

Add a new book
Update a book
Merge pull request #17 from ducnhat1989/Edit_Book

Update a book
follow/unfollow
follow//unfollow
follow//unfollow