fix bug: parse posts in ‘帖子消息’ with ‘以下是新回复’
fix bug: ‘帖子消息’ multiple replies for one thread, the jump to floor doesn’t work for the second reply
add feature: ‘回复了你的主题’ can be jump to the unread post
fix bug: only use post cache if the find_pid match
Merge pull request #2 from nkcfan/master

improvements on '帖子消息' page