Added Combinatorial classes#627

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codecypher wants to merge 8 commits intomathnet:masterfrom

codecypher:master

Commits on Mar 14, 2019

Added combinatorics classes
Jeff Holmes
committed

Commits on Mar 25, 2019

Added unit test
Jeff Holmes
committed
.gitignore fixed
Jeff Holmes
committed

Commits on Mar 26, 2019

Fixed namespace
Jeff Holmes
committed
Fixed solution file
Jeff Holmes
committed
Fixed namespace for Combinatorics class
Jeff Holmes
committed
Added compatibility nuget package
Jeff Holmes
committed
Restored FSharp.csproj
Jeff Holmes
committed