finish sign in with github
implement user login
fix user login bugs
update schema.rb
update annotate
fix bug and code cleanup
finish sign in with github
implement user login
fix user login bugs
update schema.rb
update annotate
fix bug and code cleanup
rebase from master branch
fix user sign-up bug and finish this feature
code cleanup
translate english to chinese
Merge pull request #14 from xian-rubyists/user-login

Fixed #3