Create a nice API

My plan is to create a bunch of example scripts reproducing papers in computational social choice theory, and then after getting a bunch of features implemented, figure out the best way to package them all up in a nice API. I have no clue what it would look like, though.

* Should be able to specify a number of voters, or a set/list of numbers of voters
* Should be able to specify a number of candidates, or a set/list of numbers of candidates
* Should be able to specify a single voting system or a set of them
* Should be able to support strategies
* Should it always calculate the Cartesian product of the above sets? No, because of examples like https://github.com/endolith/elsim/blob/master/examples/merrill_1984_table_2.py
* But it should be easy to specify that you want the Cartesian product of the input sets...
* Parallelization should be automatic, but user should be able to override the backend to turn it off, compute it on a cluster, or whatever
* etc.