use 'rake poll_douban' to poll data from douban instead of querying on demand
fix gemfile following heroku's suggestion
add gemfile.lock
use image tag instead of using url directly
add layout: header, login, logout, etc
do not show read info if not joint group
add 'show more toggle'
show read percentage in group
add prompt info after link with douban; remove turbo link to avoid the js bug; add link to home page for site logo(团队阅读)
remove the books_users association table; introduce concept of read_records
styling
fix image
update production domain