Merge pull request #17 from leancloud/wujun_wp

wp realtime chat doc.
add cloud code simple mode docs
fix Header style
Merge pull request #18 from leancloud/cloud-code-simple-mode

add cloud code simple mode docs
Improved cloud_code_commandline.md
add leanchat link
add server timestamp hint
绑定域名前需要 设置avosapps.com的字域名
fix a bug for space.