Blossom algorithm for matching

[CarloLucibello]

so that now we can match also non-bipartite graphs, yay! Ref #14

[codecov-io]

Current coverage is 100% (diff: 100%)

Merging #16 into master will not change coverage

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[CarloLucibello]

I'm merging this tomorrow if there aren't any objections

[sbromberger]

Looks good to me from a style/integration standpoint. I can't speak to functionality.

[sbromberger]

@CarloLucibello if it passes your functionality tests, feel free to merge (also close out #14). Thanks!

[CarloLucibello]

let's go then!