Updated example to be iOS 7 only
Refactored validateResponse: to return NO in error conditions
Fixed issue where default headers were not getting applied
Merge pull request #1171 from kcharwood/example

[2.0] Updated example to be iOS 7 only
Merge pull request #1172 from kcharwood/validate_response_error

[2.0] Refactored validateResponse: to return NO in error conditions
Returning early rather than spanning variable
[Issue #1170] Fix logical error in determining whether to run success or failure block for data tasks
Merge pull request #1173 from kcharwood/afserialization_default_headers_fix

[2.0] Fixed issue where default headers were not getting applied
Re-adding operation creation, cancellation, and batching to AFHTTPClient
Merge branch '2.0' of github.com:AFNetworking/AFNetworking into 2.0
base64Encode -> base64EncodedStringWithOptions
[Issue #1174] Using copy storage type for dispatch_*_t properties
[Issue #1176] Implementing -canProcessResponse for base serialization
Return YES for canProcessResponse: if acceptableContentTypes is nil (allow for opt-out)
[Issue #1177] Adding upload/download progress callback setters for individual tasks