Add new Packt book.
Replacing Rake with Cake to generate doc:site

rename files; update theme
Merge pull request #3198 from jiyinyiyong/doc-in-echo

Use cake to generate doc:site
translate first paragraphs
Merge pull request #1 from jiyinyiyong/cn

翻译页面开头部分
change CNAME
merge doc change
add Google Analytics tracking code