don't display post button on sidebard if user is logged out
Merge pull request #21 from lidashuang/master

add avatar_url and use v2ex gravatar cdn
Add mention `@` notification
Add a space after mention link
Temporary remove posts by user id
Update README.md
Update README.md
Add contribution section to README.md
Add user ranking and forum stat to category pags
fix typo
enlarge brand size
support displaying emoji
Add complete list of emoji on github cdn
Update README.md
read session secret from env in production
localize time