Bumping version to 2.0.2
It's easier to subclass AFHTTPRequestOperationManager and AFHTTPSessionManager if the `manager` method uses the current class type instead of a hardcoded one
Merge pull request #1557 from bpoplauschi/subclass_managers

Subclass AFHTTPRequestOperationManager and AFHTTPSessionManager
posting AFNetworkingTaskDidFinishNotification on main thread is now guaranteed and no longer breaks AFNetworkActivityIndicatorManager
[Issue #1562] Setting default security policy on AFURLSessionManager, rather than AFHTTPSessionManager
Merge branch 'master' of github.com:AFNetworking/AFNetworking
Merge pull request #1560 from kubbing/master

posting AFNetworkingTaskDidFinishNotification on main thread