Added my F# cal command
Adding my own solution
Adding my own solution.
Merge pull request #2 from jgardella/master

Adding jgardella's solution.
Merge pull request #1 from rcmaniac25/master

Added my F# version of cal command
Merge pull request #4 from nbevacqua/master

added our cal implementation
Merge pull request #3 from jdan/master

Test solution