Added SDWebImageCompact.m to Compile sources of the SDWebImage+MKAnnotation target
Support a maximum disk cache size in -cleanDisk.

Previously, -cleanDisk would only remove cache files that were older
than the configured expiration date.  This allowed the disk cache to
grow significantly if a large number of resources were cached over a
short period of time.

This change adds a second (optional) size-based cleaning pass that
removes files from the disk cache until its overall size falls below
half of the configured maximum size.  Older files are deleted first.

The size-based pass is disabled by default (maxCacheSize == 0).
Added auto release pool to keep memory foot print down when retrieving image from disk in queryDiskCacheForKey
Fix completionBlock setter semantics

Using `SDDispatchQueueSetterSementics`, which might be `assign` for a block is a terrible idea.
Merge pull request #362 from 0xced/patch-1

Fix completionBlock setter semantics
Merge pull request #353 from jparise/max-cache-size

Support a maximum disk cache size in -cleanDisk.
This is an attempt to avoid the crashes in #341.

It won't fix the underlying issue but I hope it will avoid it in most cases.
The various crash reports indicate the underlying download operation is being
freed before the async block in dataReceived is being executed.

This fix change tries to avoid every calling the async block.
Remove async calls from SDWebImageDownloader.  The operation is already run in a background thread also the async calls are unnecessary.
Merge pull request #373 from cfis/download_cleanup

More SDWebImageDownloader Cleanup
Merge pull request #340 from odanu/master

Add SDWebImageCompact.m to Compile sources of the SDWebImage+MKAnnotation target
Fix and make SDScaledImageForPath extensible
Make SDWebImageManager cache creation extensible
Merge pull request #366 from bm-i/master

Fix and make SDScaledImageForPath extensible
support GIFs
cache the GIF data instead of the jpeg representation
updated formatting for project
change var name
Merge pull request #375 from lavoy/master

Animated GIF Support
Scale GIF images
moved scaling up the process