new version of packages

built binaries for:

numpy 1.7.1
scikit-learn 0.14.1
scipy 0.12.0

Changed paths inside old archives to reflect new organization of paths in the upstream heroku-buildpack-python.

Only accept this pull request if pull request for heroku-buildpack-python is also accepted (paths must be updated there too).

Unfortunately, there are a bunch of binary deltas in this repo now which might cause the cloning of npscipy-binaries to be slower. I had already changed this step so that only the archives that were required were cloned, but I'm not sure if that is really mitigating the binary deltas. Stackoverflow suggests actually following this: https://help.github.com/articles/remove-sensitive-data to get rid of binary deltas, but I'm not sure how it will affect the forks.