Basic, debugged, Paxos implementation

This does not implement MultiPaxos, preferring to do each round
individually.  It's super-inefficient!
rename message to all-caps, better words
split cluster up into a sequence of developing files
ignore .pyc
Merge pull request #4 from djmitche/introduce-cluster

Introduce cluster
Add me to the README
Merge pull request #3 from djmitche/gitignore-pyc

ignore .pyc
Merge pull request #6 from djmitche/add-me-to-readme

Add me ot the README
Updating README with a clearer mission statement
Add me to README too
Merge pull request #8 from audreyt/patch-1

Add me to README too
Merge pull request #7 from gvwilson/master

Updating README with a clearer mission statement
Adding guidelines re: early and subsequent PRs.
Merge pull request #9 from MichaelDiBernardo/guidelines

Adding guidelines re: early and subsequent PRs.
Merge branch 'master' of github.com:aosabook/500lines
Add to readme