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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Merge pull request #779 from ThomazL/master

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[Translated]How to convert an HTML web page to PNG image on Linux
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[Translated]How to convert an HTML web page to PNG image on Linux.md
Merge pull request #780 from KayGuoWhu/master

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