isRunning method added at SDWebImageManager
Merge pull request #260 from kawanet/master

isRunning method added at SDWebImageManager
Add imageFromMemoryCacheForKey: method to synchronously query the memory cache (fix #263)
Fix podspec (fix #253)
Merge remote-tracking branch 'upstream/master'

* upstream/master:
  Fix podspec (fix #253)
  Add imageFromMemoryCacheForKey: method to synchronously query the memory cache (fix #263)
  isRunning method added at SDWebImageManager