add chapter04 part, to be continue, update cpp Makefile
Merge pull request #134 from liuyang1/master

add chapter04 python & cpp verison part. update cpp Makefile
Update 03.0.md
Update 03.0.md
Update 03.0.md
Update 03.0.md
Update 03.0.md
Merge pull request #133 from marchtea/master

修改README.md, 增加使用脚本的提示
fix chapter 03.04 incorrect img url format
Update 03.04.md
remove all ?raw=true in img links