documented workaround for frameworks that extend optional libraries
Added and exposed some methods that allow to check if an image exists on disk without taking it off disk and decompressing it first. Makes for a nice performance boost when checking if many files exist in the disk cache already
Fixed styling to match rs/SDWebImage repo
Share schema so it can be used by Xcode bots
Only use the runloop with timeout on iOS 5 (fix #497)
Remove WebP support from default target and add a dedicated target

Too many people have issue with WebP library dependancy.
Merge pull request #498 from donholly/master

Added and exposed some methods that allow to check if an image exists on...
Removed strong reference to UIImageView which was causing a crash in the nested block.
Merge branch '63d60d9'
Merge pull request #522 from redhand/master

Removed strong reference to UIImageView in nested block
Fix WebP target
Add option to continue download in background
Provide background option through the manager
Merge pull request #534 from pixable/ios-background

iOS Background: Provide background option through the manager
Fix link to "Who Uses SDWebImage" wiki page
Merge pull request #537 from raylillywhite/patch-1

Fix link to "Who Uses SDWebImage" wiki page
Update argument list for example in README
Merge pull request #539 from sibljon/patch-1

Update argument list for example in README
Use UIImagePNGRepresentation to preserve transparency
Only perform `NSLog` statements if `SD_VERBOSE` is defined