Updated delegates to match Objective-C patterns and allow for multiple images per row

Hello. I first want to thank you for this library which has saved me countless hours over the last 18 months. 

I had to make an update today because I was designing a table cell which had two images in it. I used a model that was really similar to UITableView and passed the object through to all of the delegate methods so the delegate class could choose what to respond or how to act in repsonse to different MHLazyTableImages objects.

Thanks!

Josh