documented workaround for frameworks that extend optional libraries
Break a retain cycle
Update README.md

Minor fix to callback arguments. NSData included now.
Use an empty string to if str was NULL.
added multiple download of images for animationImages property of UIImageView
Added background clean disk to UIApplicationDidEnterBackgroundNotification #306
Fix downloadImageWithURL:options:progress:completed returning nil (fix #464)
Call handlers on the main thread synchronously to enhance responsivity (fix #462)
Always call the completedBlock from main thread (fix #397)

This is not a good practice but doing otherwise leads to a lot of mistakes
Try to fix the thread block (#399)
Fix unreleased operation (fix #466, fix #444)
Fix the dead thread bug on iOS 5 (fix #466)
Update README.md
Canceling the SDWebImageOperation will also cancel the expensive disk cache query operation.
The callbacksForURL: method of SDWebImageDownloader now returns a copied array. This should fix the crash in multithread environment such as:
Collection <__NSArrayM: 0x226d9310> was mutated while being enumerated.
Change version to 3.4
Use 'default_subspec' and separate the WebP support to its sub-spec

This removes unnecessary dependency to 'libwebp' for users who don't need WebP support.
Fix sub-spec dependency
Update webp to upstream head
Update project to comply with Xcode 5