Update SDWebImage to 4.0#597

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WilliamCheen wants to merge 2 commits intomwaterfall:masterfrom

WilliamCheen:master

Commits on Apr 7, 2017

Modify podspec dependency library version. SDWebImage from 3.7 to 4.0, MBProgressHUD 0.9 to 1.0, DACircularProgress 2.0 to 2.3.1.
william
committed
Update to be compitable with SDWebImage version 4.0 and MBProgressHUD 1.0 DACircularProgress 2.3.1 .
william
committed