Changes to KLScrollSelect to work on iOS 5

@KieranLafferty

I wanted to use KLScrollSelect on iOS 5 but I couldn't do that.
There was two problems:
1- On iOS 5 we can't use registerClass it is introduced on iOS 6
2- On iOS 5 willMoveToSuperview method is called every time the cell is used or reused so initializing image in that method causes low performance scrolling

I changed KLScrollSelectDemo/KLViewController.m to resolve problem No. 1 and
KLScrollSelect/KLScrollSelect.m to resolve problem No. 2

Best Regards,
Nima Azimi