Dynamic Image Properties

[DavidGagne]

I often need to use .scaledToFit() instead of .scaledToFill(), and I think the scalability of the UrlImageView() could be improved with the ability to configure the dimensions of the returned image instead of forcing 100 × 100.

I'm going to take a stab at revising and will keep you apprised.

(Not sure if this is the correct way to address these issues, but thought I'd take a shot.)