AFJSONRequestSerializer: nil parameters in requestBySerializingRequest: fix; and behaves same as in AFURLRequestSerialization
Merge pull request #1326 from kubbing/2.0

AFJSONRequestSerializer: nil parameters in requestBySerializingRequest: ...
[Issue #1323] Making debugSecurityPolicy defaultSecurityPolicy

Adding +securityPolicyWithPinningMode:

Removing securityPolicy property from UIImageView
Merge branch '2.0' of github.com:AFNetworking/AFNetworking into 2.0
[Issue #1324] Setting manager security policy on created request operations
[Issue #1322] Fixing race condition related to moving download from temporary path
[Issue #1322] Fixing response object of download task completion handler

Removing duplicated finish notification for download task
Extracting content-specific subclasses to AFNetworking/AFContentRequestOperations
Removing AFSerialization.h
Extracting Rocket functionality into AFNetworking/AFRocketClient
Updating documentation for UIImageView category responseSerializer
Correcting typo in AFHTTPRequestOperationManager documentation
Updating documentation
[Issue #1321] [Issue #1316] Removing use of iOS 7 / Mac OS X 10.9 APIs in request serialization, reverting to 1.x implementations
[Issue #1311] Implementing URLSessionDidFinishEventsForBackgroundURLSession: delegate method, with callback block properties and updated documentation
Set defaultPolicy to not allow invalid certs
Updated Security Unit Tests
Merge pull request #1327 from kcharwood/security_fixes

[2.0] Default Security Policy should not allow invalid ssl certificates (and unit test updates)
Merge remote-tracking branch 'upstream/2.0' into 2.0