Merge pull request #774 from Linchenguang/master

【翻译完成】Moving or Rename File / Directory in Linux ....
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[Translated] Ubuntu 14.04's System Settings received show/hide username option
Rename sources/Ubuntu 14.04's System Settings received show／hide username option.md to translated/Ubuntu 14.04's System Settings received show／hide username option.md
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Merge pull request #775 from vito-L/master

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发布：Daily Ubuntu Tips – Use Spotify In Ubuntu Linux
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Merge pull request #776 from vito-L/master

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Update How to set up RainLoop webmail in Ubuntu server.md
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Merge pull request #778 from vito-L/master

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发布：Daily Ubuntu Tips – Upgrade To Ubuntu 14.04 (Trusty Tahr) From 13.10
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