Revert "Merge pull request #27 from luisobo/14-find-or-create"

This reverts commit 26044176c3a9d72bd452f6ffa3a859a291ef6b8e, reversing
changes made to 2922d0ac3aac88ee8b130ad33c5cc5da740059ee.
We should setup persons before and after each run
Implements find or create functionality

Fix #14
Use lastObject instead of firstObject since the former has always been publicly available

That way we can still compile the project with iOS 6.X SDK.
Update build config files