Merge pull request #3 from julycoding/master

Update
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建议把“Nut/OS中atoi的实现”放到别处，如在附录添加一章“延伸阅读”
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建议将“linux内核 atoi实现”放到附录“延伸阅读”中
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排版问题
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检查一下
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修改一些描述
Merge pull request #5 from ChanYuLeung/patch-2

update master
Merge pull request #296 from ChanYuLeung/patch-2

减少“字符串转换成整数”的篇幅-重新提交:-)
Merge pull request #295 from ChanYuLeung/master

减少“字符串转换成整数”的篇幅
Update 01.04.md
Update 01.04.md
Update 01.04.md
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Update 01.05.md
Merge pull request #7 from julycoding/master

update patch-2