ENH: improved build script on OSX

Doesn't use sudo (so hopefully fewer permissinos issues)

Uses `ditto` to strip out ppc and x86_64 architecture binaries
(saves ~100Mb in the app)
BF: nxutils.pnpoly() can have problems, so add try-except

matplotlib 1.2.0-r1 on gentoo does have nxutils, but raised:
AttributeError: 'numpy.float64' object has no attribute 'frozen'

fix: try-except will now fall through to pure python.
long-term, might be better to figure out what is going on, might be a more
general issue for matplotlib 1.2.0-r1 (I use matplotlib 1.1.0)
Merge pull request #244 from jeremygray/master

nxutils can be present but not work for point-in-polygon stuff
Added script reference for launcher
Merge pull request #245 from TheChymera/master

script reference for 'psychopy/app/psychopyApp.py' (thanks to Christian Horea)
BF: loadFromXML checks 'componentsFolders' option.