finished bookmanage.js

addBook = function(isbn,success_callback,error_callback)
removeBook = function(bookobj,success_callback,error_callback)
listNearBook = function(callback)
listBookByUser = function(userObj,callback)
listUserByBook = function(bookObj,callback)
descending by time

bookmange.js descending by time
Merge pull request #27 from Nihiue/master

finished bookmanage.js