Fixed bug where NSInvalidArgumentException was thrown if an image with a nil URL was downloaded.
Removed creation of NSError when a nil URL is downloaded.
Merge pull request #274 from reidmain/master

NSInvalidArgumentException is thrown if a nil NSURL is downloaded.
Fixed CGBitmapContextCreate warnings for invalid alpha properties
Invalid cost calculation when saving image to memory cache
Merge pull request #278 from Reflejo/invalidcost

Invalid cost calculation when saving image to memory cache
Merge pull request #277 from Reflejo/upstream

Fixed CGBitmapContextCreate warnings for invalid alpha properties
Bump version to 3.1
Share framework target
Migrate the no longer github supported download page to a wiki page
Check SDWebImageCacheMemoryOnly for disk caching
Merge pull request #287 from NachoSoto/disk-cache

Check SDWebImageCacheMemoryOnly for disk caching
Revert "Fixed CGBitmapContextCreate warnings for invalid alpha properties"

This reverts commit 12196f4de69268dc994ba3d5bc04a11568177520.
It adds alpha on JPEG with no alpha.
Fix downloader queue using assign instead of strong under iOS 6
Add synchronous disk-cache loading method.
Merge pull request #297 from inamiy/disk-cache

Add synchronous disk-cache loading method.
Merge remote-tracking branch 'upstream/master'

* upstream/master:
  Add synchronous disk-cache loading method.
  Fix downloader queue using assign instead of strong under iOS 6
  Revert "Fixed CGBitmapContextCreate warnings for invalid alpha properties"
  Check SDWebImageCacheMemoryOnly for disk caching
  Migrate the no longer github supported download page to a wiki page
  Share framework target
  Bump version to 3.1
  Invalid cost calculation when saving image to memory cache
  Fixed CGBitmapContextCreate warnings for invalid alpha properties
  Removed creation of NSError when a nil URL is downloaded.
  Fixed bug where NSInvalidArgumentException was thrown if an image with a nil URL was downloaded.