RPN+Calculator+Division

As a user, I want to be able to divide two numbers so that I don't have to do the work manually

UAT

 * [] 4 2 -> [2]
 * [] 3 2 -> [1.5]
 * [] -4 -8 -> [.5]
 * [] 0 5 -> [0]
 * [] 4 0 -> division by zero error

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