Merge pull request #685 from geekpi/master

[Translating] 29 Practical Examples of Nmap Commands for Linux System/Network Administrators
发布：Understanding Linux cd Command with Examples
	deleted:    "29 Practical Examples of Nmap Commands for Linux System\243\257Network Administrators.md"
	29 Practical Examples of Nmap Commands for Linux System & Network Administrators.md
	new file:   29 Practical Examples of Nmap Commands for Linux System & Network Administrators.md
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发布：Linus Torvalds Releases Last Linux Kernel 3.13 RC for 2013
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Merge pull request #686 from geekpi/master

[Translating] 29 Practical Examples of Nmap Commands for Linux System,Ne...
remove unused files