documented workaround for frameworks that extend optional libraries
Added method to SDWebImageManager to check if an image exists in either the disk OR the memory cache
Fixed issue where cancelled operations aren't removed from runningOperations
Create NSOperation when start operation.
Method getDiskCount returns NSUInteger.
Overload -setImageWithURL to delay setting of placeholder image until after loading
Moved the delay placeholder flag to SDWebImageOptions
Updated bitwise operator to correctly find option if more than 1 are included
Wrapped placeholder check in parens to work with bitwise
Adds -[SDWebImageManager saveImageToCache:forURL:] method
fix UIImageView+HighlightedWebCache call error method
#725 adding completition block when removing image from cache, added an extra method so we don't break compatibility with older versions
fixed SDWebImageRefreshCached bug for large images
Merge pull request #744 from Pei116/master

fixed SDWebImageRefreshCached bug for large images
Merge pull request #732 from dchohfi/master

#725 adding completition block when removing image from cache
Updated README.md to fix #476
Fixed #384 (documentation wrognly stated a return type was NSOperation)
Added SDWebImageCompat.m to SDWebImage+MKAnnotation target
Documented SDWebImageDownloaderOperation initWithRequest:options:progress:completed:cancelled: method. Fixes #526
Merge pull request #701 from billburgess/delayplaceholder

Delay the loading of the placeholder image until after load
Keep a reference to the image URL