Add UIAppearance background color support to SDPhotoImageView and SDPagingView and expose zoomScale from SDPhotoImageView
Remove UIAppearance, support paging view calling layout subviews multiple times
Merge pull request #20 from walmartlabs-samsclub/feature/UIAppearance_PagingPhoto

Add UIAppearance background color support to SDPhotoImageView and SDPagi...