PromiseKit integration
Documentation for promised methods
Add a stillValid parameter to UIImageView+SGImageCache methods
When moving a task to the slow queue, only move it to slow queue if it existed in the fast queue.
Update podspec
remove cachedImageURL from UIImageView category
Revert source changes in podspec
Merge branch 'master' of https://github.com/seatgeek/SGImageCache
Update to reinclude cachedImageURL in UIImageView+SGImageCache
Merge branch 'master' of git://github.com/dbachrach/SGImageCache into master