Updated SDWebImage to version 3.5.4

Build failed with SDWebImage 3.5.4 because SDWebImage's progress block interface was changed from `^(NSUInteger receivedSize, long long expectedSize)` to `^(NSInteger receivedSize, NSInteger expectedSize)`.
I've fixed this incompatible issue with below modification.
- Modified progress block interface
- Renew `MWPhotoBrowser/Libraries/SDWebImage`
- Update podspec