Merge pull request #347 from WenchaoIOS/patch-2

Footer加上MJRefreshFrameworkSrcName

MJRefresh/Custom/Footer/Back/MJRefreshBackNormalFooter.m

@@ -20,12 +20,14 @@ @implementation MJRefreshBackNormalFooter
 - (UIImageView *)arrowView
 {
     if (!_arrowView) {
-        UIImageView *arrowView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:MJRefreshSrcName(@"arrow.png")]];
+        UIImage *image = [UIImage imageNamed:MJRefreshSrcName(@"arrow.png")] ?: [UIImage imageNamed:MJRefreshFrameworkSrcName(@"arrow.png")];
+        UIImageView *arrowView = [[UIImageView alloc] initWithImage:image];
         [self addSubview:_arrowView = arrowView];
     }
     return _arrowView;
 }
 
+
 - (UIActivityIndicatorView *)loadingView
 {
     if (!_loadingView) {