Ensure scripts are installed in NuPIC install directory
Merge pull request #144 from oxtopus/pip-install-scripts

Ensure scripts are installed in NuPIC install directory
PIL removal

remove obsolete PIL/Imaging/Python Image Library,
it was used for image recognition, is now unsupported
and obsolete.

Used eg in people-tracking-demo
PIL add notice to demo using PIL

maybe it got broken, well, it's broken anyway
remove libpng

was used as dependency of PIL (obsoleted too)
mention PIL in requirements.txt for pip
remove numpy license, it's a dependency now