Add .clang-format file
Convert to ARC
Move to ARC, refactor RCImageStore and add a couple of tests

Also, add new APIs which allow requesting an already resized image.
Add test app for Mac
Make bg operations in RCImageStore use the default priority
Correctly lock access to the shared mimeTypes dictionary
Fix memory leak
Alwayse use ImageIO to decode images

Calling [[UIImage alloc] initWithData:] is not thread safe anymore
as of iOS 8.1 (probably a bug, but it's present in the final release).
Rework RCURLCacheViewController to look nice on iOS 7+

Also, remove now unused images and remove RCURLCacheViewController
from the Mac lib rather than using an ifdef at the top of the file.
Use the ifdef in RCURLKit.h
Fix crash on iOS

It looks like UIImage initializers have become non thread-safe.
Altought the current code could still enter in race conditions
with the app code, at least now it won't interfere with itself.

If we find this to be a problem in the future, code for instantiating
UIImage objects will be moved to the main thread. Since the decoding
is already done using ImageIO in the background, the performance
penalty should not be noticeable.