Don't let AFURLConnectionOperation accept a nil request

Closes #1064
Inflate (decompress) image data in the background, as a part of AFImageRequestOperation -responseImage (when targeting iOS)
Adding #import for CoreGraphics
Adding automaticallyInflatesResponseImage property to AFImageRequestOperation

Falling back on initWithData:scale: initialization when available (iOS > 5)
Merge pull request #1070 from AFNetworking/experimental-background-image-inflation

Improved Image Loading Performance By Inflating Image In Background
Upgrading project settings for Xcode 5
Merge branch '1064_parameter_assert' of https://github.com/kylef/AFNetworking into kylef-1064_parameter_assert
[Issue #1065] Remove test for NSParameterAssert raise
Bumping version to 1.3.1
Update the Podfile.lock to reference the new specfile hash (1.3.1)
Merge pull request #1074 from kylef/podfile-lock

Update the Podfile.lock to reference the new specfile hash (1.3.1)
Allow fallback to generic image loading when PNG/JPEG-specific loads fail.
Change size_t value from NULL to 0 to suppress compiler warning.
Merge pull request #1075 from Nuzzel/bugfix/handle_incorrect_image_contenttype

Allow fallback to generic image loading if PNG/JPEG-specific loads fail
Adding CoreGraphics framework to podspec
Return early in AFGetMediaTypeAndSubtypeWithString if string is nil
Removing what appears to have been unnecessary ceremony and incantations for keeping the network thread runloop running.
Merge pull request #1076 from Nuzzel/bugfix/fix_type_warning

Change size_t value from NULL to 0 to suppress compiler warning.
Adding Mach port to keep runloop alive
Disabling SSL Pinning mode for Mac example