更新“介绍”部分#2

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endlesstravel wants to merge 3 commits intocyh24:masterfrom

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Commits on Nov 17, 2015

更新“介绍”部分
 endlesstravel
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Commits on Nov 18, 2015

为02.1-Command.md, 02.2-Flyweight.md添加了语法高亮
 endlesstravel
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Commits on Nov 19, 2015

更新了亨元模式中的最后一节“更多请参阅”并润色了相关词语。
endlesstravel
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