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 duplicate symbols when using with webp via pods
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
Synthesize `executing` and `finished` properties.

It wouldn't build on Xcode 6 otherwise.
Fix getter names. Fixes commit: 097b502eae

The getters of the properties “executing” and
“finished” both use custom getter names.

097b502eae implemented the wrong getter names
without the “is” prefix.
Merge pull request #742 from openresearch/master

Fix getter names. Fixes commit: 097b502eae
fixed SDWebImageRefreshCached bug for large images
Merge pull request #741 from martinblech/master

Synthesize `executing` and `finished` properties.
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
Resolve race condition.

While exceedingly unlikely, the old construct introduced potential race condition where it checked wself first, and assigned sself second. This now assigns sself first, and then checks that, which is the correct pattern, already used elsewhere in SDWebImage.