Use set-env instead of export
Fix set-env
Fix typo
Merge pull request #6 from thenovices/test

Merge in latest Heroku commits; minor typo fixes.
Restore README.md
Add option for pip-grep to print out requirement
Refactor numpy-scipy step

- Refactor out into functions
- Prepare for handling mulitple versions
- Use pip-grep for recursive requirements.txt
Merge pull request #7 from thenovices/test

Refactor numpy-scipy
Add NumPy version 1.9.0
Fix variable typos
Update README
Merge pull request #8 from thenovices/numpy-1.9

Numpy 1.9
Print message if defaulting to latest version
Update README
Add NumPy versions 1.6.2, 1.7.2, 1.8.2
Update README
Add SciPy 0.13.3, add disclaimer about NumPy/SciPy inter-compatibility
Update README