Adds SSLPinningMode to AFURLConnectionOperation and defaultSSLPinMode to AFHTTPClient.
Fixes memory leak.
Gets rid of for loop to check if public key is present.
Added in a property to handle invalid SSL certs
Compare NSURLRequest rather than NSURL

If you inadvertently load a nil URL in UIImageView+AFNetworking, the failure block of the image request operation is bypassed because [nil isEqual:nil] == NO. By comparing the URL request instead of the URL, the `isEqual:` test passes and the error is properly forwarded to the failure block parameter.
Adding lock around AFHTTPRequestOperation -responseString
Adding lock around AFURLConnectionOperation -responseStringEncoding

Adding check for self.response in AFURLConnectionOperation -responseStringEncoding
Merge pull request #772 from 0xced/fix-uiimageview-nil-url

Compare NSURLRequest rather than NSURL
Fixing warnings caused by implicit property attributes
Ignoring -Wcovered-switch-default in AFHTTPBodyPart -hasBytesAvailable
Merge branch 'master' of github.com:AFNetworking/AFNetworking
Using DISPATCH_QUEUE_CONCURRENT for all calls to dispatch_queue_create for media type processing queues
Use dispatch_once to initialize content-type-specific processing queues

Signed-off-by: Mattt Thompson <m@mattt.me>
Added support for repeated key value pairs through use of NSSet
Merge pull request #778 from Neonkoala/master

Support for repeated key value pairs in URL encoded forms
Stashing merge
Fixed comment typo

Minor typo.
Merge pull request #786 from tewha/patch-9

Fixed comment typo
Replacing #ifdef macro check for Security to _AFNETWORKING_PIN_SSL_CERTIFICATES_
Removing #warning about Security framework