Merge pull request #1923 from geekpi/master

[Translating] Linux FAQs with Answers--How to install REMI repository on...
Merge pull request #1924 from geekpi/master

[Translated] Linux FAQs with Answers--How to install REMI repository on ...
Delete 20141024 Amazing 25 Linux Performance Monitoring Tools.md
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Merge pull request #1925 from andyxue/master

[Translated]Amazing 25 Linux Performance Monitoring Tools
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PUB:20140812 How to set up a USB network printer and scanner server on Debian

@GOLinux
PUB:20140821 How to configure a network printer and scanner on Ubuntu desktop

@disylee
PUB:20140910 How to monitor server memory usage with Nagios Remote Plugin Executor (NRPE)

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[Translating] How to Install MariaDB in Ubuntu 14.04 LTS