Add skeletal files, update README
Implement count-alive, flesh out implementation details
Move some definitions around, move test code to drscheme-driver.scm
Add next-gen-cell, along with some refactoring

* Implement next-gen-cell
* Refactor count-alive to be recursive
* Add implementation notes for neighbors
* Add debug printing and more tests to drscheme-driver
Update README to reflect the actual modules.