Added two methods to SDTableViewSectionDelegate/SDQuantityView.m tweak

I added two new methods to SDTableViewSectionDelegate:
- (void)sectionController:(SDTableViewSectionController *)sectionController scrollViewDidScroll:(UIScrollView *)scrollView;
- (CGFloat)sectionController:(SDTableViewSectionController *)sectionController estimatedHeightForRow:(NSInteger)row;

Also changed how the right image view is added in SDQuantityView.m.  Though I don't have any recollection of doing it and it is quite possible it was done in my sleep.