Merge pull request #1 from jasteralan/master

Translate zh_TW PSR-1, PSR-2, PSR-4
Merge pull request #2 from jasteralan/master

change zh_TW to zh-TW
翻譯 PSR-3
修正錯字
Should 應翻譯為 應該
translate rfc 2119 keywords to zh-TW