optimize the gql query for User
optimize some gql queries in books package
add a batch fetch method in Book, not used though
add the fetching & parsing code for getting book from Tongji Library
fix a bug of unable to get the status of book in TJ Library in some situations
it will display a tongji icon when there is a link to tongji library
it can display tongji status in book_full view
it can display all the tongji library info on book_full view
now it can also display tongji library information on brief views
the search box in nav bar can now directly input isbn
add a refresh button in book full view to refresh tongji library information
add the refresh all button in booklist page
also load from tongji when import from douban
fix the bug of importing duplicate information from TJ Library