[issue2138] Add a factorial function

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

Wish I could be at the sprint.  I'm back in Los Angeles.  My little post
will have to suffice.  

I thought it was a reasonable request and would hate to see it killed
because other people piled on other requests that were not reasonable. 
I don't buy the reasoning that you have to reject factorial just because
someone else might someday want binomial or a gamma.

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