Originally developed for Networkx 1.11. Upgraded to be compatible with Networkx 2.0 ... potential issues with Networkx 2.1 API Issues: - [ ] `networkx.algorithms.matching.max_weight_matching` returns a `set` in 2.1 vs a `dict` in 2.0. See [2.0 doc](https://networkx.github.io/documentation/stable/reference/algorithms/generated/networkx.algorithms.matching.max_weight_matching.html#networkx.algorithms.matching.max_weight_matching) vs [2.1 doc](https://networkx.github.io/documentation/stable/reference/algorithms/generated/networkx.algorithms.matching.max_weight_matching.html#networkx.algorithms.matching.max_weight_matching)
