Merge pull request #658 from geekpi/master

[Translating] userdel Command - Delete User Account from Linux system
test
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Merge pull request #659 from Timeszoro/master

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Merge pull request #660 from yechunxiao19/master

翻译完成 by乌龙茶
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Merge pull request #662 from yechunxiao19/master

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Im back
Merge pull request #663 from crowner/master

Im back

欢迎回来~~
发布：10 Useful Chaining Operators in Linux with Practical Examples
Update How To Properly Install Ubuntu One In Linux Mint 16.md
Merge pull request #664 from yechunxiao19/patch-3

Update How To Properly Install Ubuntu One In Linux Mint 16.md
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Merge pull request #665 from yechunxiao19/master

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Merge pull request #666 from Luoxcat/master

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