Added the degree of the process of nginx config system.
Merge pull request #8 from nkysg/master

fix typos in chapter 2. thanks to nkysg.
Merge pull request #9 from nkysg/master

路径分隔符不小心写错了。 thanks to nkysg
Update source/chapter_05.rst
Merge remote branch 'taobao/master'
Add nginx architecture of nginx and request processing in chapter 2.
Fixed some issues from wangwei1237 at github.
Merge pull request #18 from fanjizhao/master

 Add nginx architecture of nginx and request processing in chapter
fix wrong words
Merge pull request #26 from wangbin579/master

fix wrong words
fix some sentences in chapter12
fix some sentences in chapter12
Merge pull request #27 from jinglong/master

fix some typos in chapter12
Update source/chapter_02.rst
Update source/chapter_02.rst
Update source/chapter_02.rst
Update source/chapter_02.rst
Update source/chapter_06.rst

更新nginx只用边沿触发的错误描述
1, add content for chapter 12\n 2, delete unnecessary *.pyc files in exts
delete unnecessary *.pyc files in exts
add .gitignore