Merge pull request #2 from Ap0c/master

Port to python
Add REAMDE.md and change lisp.py to pisp.py (because it's python...)
Changed lisp.rb to risp.rb and modified 'require' in test.rb correspondingly.
Merge pull request #3 from drewsberry/readme

Add REAMDE.md and change lisp.py to pisp.py (because it's python...)