Update README.md
Update README.md
Merge pull request #325 from dead-horse/patch-1

Update README.md
fix #323. 修复 at 的样式。
fix #306. session 存在 mongo 中
update spaces in pages
Merge pull request #326 from jiyinyiyong/list-and-space

update spaces in pages
update markdown hint

show visit count in topic index
add link to SegmentFault
Merge pull request #330 from jiyinyiyong/improve-contet

Some improvement on topic content
fix reply2 button
fix reply box height
Merge pull request #331 from jiyinyiyong/fix-reply2-button

Fix reply2 button
精简主页的载入
接入 google 搜索. fix #334
fix #334
更精细的提示
去掉了 keyword
fix: submit with ctrl+entry or comand+enter
update jquery; drop fancybox and ajaxuploader