Fix issue #5 by update PFAssistive Framework to 3.3.1a and ...

Fix issue #5 by update PFAssistive Framework to 3.3.1a and set the
Runpath Search Path to @executable_path/../Frameworks.
Credit goes to isonic1 in issue #5 comments.
This will enable the project to run out of a fresh clone under OSX
10.9.3 and Xcode 5.1.1