AFNetworking/AFNetworking — pull request #1992 by puppybits (2014-04-13 15:59:34+00:00)
Title: Add Protocol Buffer support

`AFProtocolBufferSessionManager` is a subclass of `AFHTTPSessionManager` for sending Protocol Buffers over TCP.
## Serialization

AFURLRequestSerialization and AFURLResponseSerialization is not used because they can not be uniquely set for the each endpoint request/response call.

## Example

NSString * send:urlString = @"/api/user";

UserRequest_Builder * builder = [UserRequest_Builder new];
builder.email = email;
builder.password = password;

UserRequest * request = [builder build];

AFProtocolBufferSessionManager * manager = self.sharedManager;

NSURLSessionDataTask * task = [manager send: urlString
request: request
response: [UserResponse class]
success: success
failure: failure];