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
Merge pull request #32 from jinglong/master

update chapter 12
update log in README
Merge pull request #33 from jinglong/master

update readme
fix the wrong date in log
Merge pull request #34 from jinglong/master

fix the wrong date in log
Update chapter_11.rst