add capistrano gem to auto deploy
modify cap deploy config
modify production config of mongoid.yml
try use faye as mount rack.
make  faye use another server of thin.
add start server doc to readme.
use rack session instead default.
modify highlight css code.
to move locales folder under the config folder
modify sign in view.
output log to a file in production env.
fix log error in production
fix session bug in production.
fix use rack session in production.
add authorize control and sign out feature.
remove search input and notifications count.
add shortcuts ctrl+enter  to create comment.
use gitcafe.com user to login.
add markdown syntax cheatsheet
remove modal fade effect.