replace blue with gray; limit navbar width; smaller fonts around title

11px for small fonts
remove reply order; use reply icon
markup @user in reply
Merge pull request #308 from jiyinyiyong/change-blue-link

Change blue link, add reply icon
remove username at edit-by
Merge pull request #309 from jiyinyiyong/edit-by

remove username at edit-by
放弃对于 0.8 的支持