Fix SVIndefiniteAnimatedView centering when using layout constraints.
Fix SVIndefiniteAnimatedView centering when using layout constraints.

Sunday4/SVProgressHUD,cnzlh/SVProgressHUD,PeeJWeeJ/SwiftyHUD,SuPair/SVProgressHUD,PeeJWeeJ/SwiftyHUD,dxt/SVProgressHUD,Dschee/SVProgressHUD,SVProgressHUD/SVProgressHUD,TransitApp/SVProgressHUD,maxcampolo/SVProgressHUD