Merge pull request #744 from geekpi/master

[Translated] Daily Ubuntu Tips - Upgrade To Ubuntu 14.04
Pick up new one
Merge pull request #745 from Vic020/patch-2

Pick up new one
发布：29 Practical Examples of Nmap Commands for Linux System,Network Administrators
翻译完成 by乌龙茶
Merge pull request #746 from yechunxiao19/master

翻译完成 by乌龙茶
[Translating] Why The Linux Desktop Doesn't Matter Anymore
20140212-1 选题
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Merge branch 'master' of https://github.com/LCTT/TranslateProject
[translated] Why The Linux Desktop Doesn't Matter Anymore
Merge pull request #747 from zpl1025/master

[Translating] Why The Linux Desktop Doesn't Matter Anymore
[Ubuntu]Daily Ubuntu Tips – Skype Minor Update Fixes PulseAudio, 64-bit Issues
[Translated] Daily Ubuntu Tips – Skype Minor Update Fixes PulseAudio, 64-bit Issues