Add cats dep#10

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davidrpugh wants to merge 10 commits intomasterfrom

Commits on Apr 30, 2018

Added State monad from cats.
davidrpugh
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Commits on May 3, 2018

Fixed merge conflicts.
davidrpugh
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Now wrapping matching algorithms in State monads.
davidrpugh
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Commits on May 6, 2018

Fixed merge conflicts.
davidrpugh
committed
Fixed missed merge conflict.
davidrpugh
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Added State monad to manytoone.DeferredAcceptanceAlgorith
davidrpugh
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Fixed merge conflicts
davidrpugh
committed
Added State monad back.
davidrpugh
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Fixed unnamed params.
davidrpugh
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fixed code alignment.
davidrpugh
committed