add category for imageView's highlighted state
Port Max's crash fix to my 3.6 fork
Merge pull request #694 from shifu/master

Port Max's crash fix to my 3.6 fork
Update SDWebImageDownloaderOperation.m

Fixing race condition that causes cancellation of one download operation to stop a run loop that is now used for another download operation. Race is introduced through -performSelector:onThread:withObject:waitUntilDone:
Merge pull request #698 from salling/master

Fixing race in SDWebImageDownloaderOperation leading to erroneous timeout.
Save image in cache before calling completion block
Merge pull request #700 from herrernst/master

Save image in cache before calling completion block
Merge pull request #646 from Whirlwind/master

add category for imageView's highlighted state
Update projects to recommended settings
Improve logging and fix arm64 warnings when printing integers with %d
Merge pull request #720 from rivera-ernesto/update_projects

Update projects to Xcode recommended settings
Merge pull request #721 from rivera-ernesto/improve_logging

Improve logging and fix arm64 warnings when printing integers with %d
It's generally a bad idea to remove items from a container while iterating through it. And fix the thread safe issue.
Merge pull request #727 from kejinlu/master

It's generally a bad idea to remove items from a container while iterating through it.
The ioQueue is "SERIAL" ，so "dispatch_barrier_async" is not needed.
Merge pull request #728 from kejinlu/master

The ioQueue is "SERIAL" ，so "dispatch_barrier_async" is not needed.
Updated README.md with CocoaPods install
add a suspension method to image downloaders
Merge pull request #734 from soundcloud/master

add a suspension method to image downloaders
merge from upstream fork