Fingerprint

[andrewheusser]

• added Fingerprint class
• added Optimal presenter class

[andrewheusser]

@jeremymanning want to look at this before I merge into master? In summary, this adds:

• A new Fingerprint class that can compute a fingerprint given an egg, and can be updated by passing additional eggs using the fingerprint.update() method.
• A new OptimalPresenter class which reorders an egg based on a fingerprint, reordering strategy (stabilize, destabilize, random) and method (permutation, etc)

I implemented all the features we discussed in this issue: #65