Added mono and Mac-specific excludes to .gitignore
Added mono and Mac-specific excludes to .gitignore

bryanedds/FSharpx.Extras,fsprojects/FSharpx.Extras,bryanedds/FSharpx.Extras,sideeffffect/FSharpx.Extras,sideeffffect/FSharpx.Extras,fsprojects/FSharpx.Extras,bryanedds/FSharpx.Extras