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