TIMOB-14434: Upgrading Facebook iOS SDK to 3.5.3

This is an initial port to the current Facebook iOS SDK. It really is a must, since the current module based on 3.1.1 fails on common user scenarios (e.g. Facebook password change). The initial pull request only covers login/logout and associated error handling - please see the README. The FBConnect directory contains the current Facebook iOS SDK, totally unchanged, with the only addition being Titanium's FBLoginButton files - this should also probably be dropped in favor of the native Facebook FBLoginView functionality. Note that the legacy Facebook.h is dropped from the Ti module files!