Add ability to do lots of business at the same time

[mbramson]

Currently, users can only do one business. It would be great if we could say how much business to do and do that much business.

Currently, all our users can do is:

irb> Business.new.perform
"Business"

It would be great if they could do this:

irb> Business.new.perform(3)
"Business Business Business"

This would let us to be a lot more efficient than we currently are being. We could do so much more business!

A new method could be added if it seems like it makes sense, so that the existing method still just returns one "Business" when called with no arguments. There are probably other ways to do this, as well.