don't add image view until the user adds an image to the qty view.  remove it if the user clears out the image.
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'origin/master' into QuantityViewImage
Merge pull request #1 from walmartlabs-asdaios/QuantityViewImage

Quantity view image
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
added scrollViewDidScroll and estimateHeightForRow to SDTableViewSectionDelegate
Merge remote-tracking branch 'upstream/master'
Merge pull request #68 from walmartlabs-asdaios/master

Added two methods to SDTableViewSectionDelegate/SDQuantityView.m tweak