Enabled DEFINES_MODULE flag in project build settings.
Moved to xcpretty to fix Travis-CI
Disabled AFNetworking Unit Tests on the OS X Test Target (as AFN does not compile on OS X target). Still active on iOS Unit Tests.
Updated AFNetworking submodule used for Unit Tests
Merge #74
Version bump to 3.1.7
Fix `.travis.yml` to be sure to run the two UnitTests targets