更新SDAutoLayout的Swift扩展，使用Swifty风格的点语法实现SDAutoLayout布局#316
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fanyuexiang wants to merge 2 commits intogsdios:masterfrom
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更新SDAutoLayout的Swift扩展，使用Swifty风格的点语法实现SDAutoLayout布局#316fanyuexiang wants to merge 2 commits intogsdios:masterfrom
fanyuexiang wants to merge 2 commits intogsdios:masterfrom
