Basic elements of extensible trait model, prior to specific refactorings and implementations
axelrod-ct-1 Lattices are independent of population classes; two methods simply return an appropriately sized NetworkX graph, and the "coordination number" of that graph (average degree).
axelrod-ct-5 Population initialization for extensible model  closes #5, partially addresses #2
axelrod-ct-2 Write overlap, stats, and OP methods for extensible model.
axelrod-ct-4 Rule class for basic extensible model - finally got it working, now trying to see if it does what I expect it to.  there's very axelrod-like behavior, convergence times seem much longer.
Fixed the Klemm statistic for extensible model.  Time to move on to semantically structure information.