Added psychopy info

64-bit does not contain psychopy backend
32-bit does

I can't however create a 0.27.4 version for the 32-bit. I upgraded all underlying packages and somehow my scipy.optimize module (used by psychopy) does not get packaged correctly anymore by py2app (it's missing a function in the packaged fortran library). It all does work from source, so I hope it's a matter of time before I find a solution for this.