closes #2035
Import UIRefreshControl+AFNetworking
Merge pull request #2045 from BB9z/UIRefreshControl

Import UIRefreshControl+AFNetworking
[Issue #2015][Issue #2040] Define AF_Require_noErr macro, to avoid compiler warning for __Require_noErr
Changing security policy to none, while new example endpoint is considered
Merge branch 'master' of github.com:AFNetworking/AFNetworking
Merge pull request #2037 from timbrah/master

closes #2035
Fixing image loading for the Mac OS X example app
Merge branch 'master' of github.com:AFNetworking/AFNetworking