Adding HTTPMethodsEncodingParametersInURI property to AFHTTPSerializer

Conditionally encoding requests as JSON or property list according to HTTPMethodsEncodingParametersInURI
Changing signature of HTTP client convenience methods

Implementing HTTP convenience methods
Minor refactoring
id -> instancetype
Using BOOL / non-void return type for method with NSError ** parameter
Adding AFHTTPSerializer +serializer
Changing block signatures for HTTP convenience methods, again

Setting default request serializer
Moving reachability static functions to top of implementation
Set default response serializers
Implementing NSURLSession delegate methods with completion handlers
Removing conditional compilation of SSL pinning macros
Removing all use of _AFNETWORKING_PIN_SSL_CERTIFICATES_
Removing conditional protocol declaration for NSURLConnectionDataDelegate
Adding documentation for HTTP client convenience methods