About to begin tdd fizzbuzz
First test passes, yay
pay attention to input
introduce 'Fizz' for 3 (only)
return fizz for all multiples of 3
return buzz for all multiples of 5
Fizzbuzz
Remove duplication in divisibility checks
Build a return string in parts instead of explicitly switching
Whitespace (uses postfix if instead of if/end)
Add (non-TDD'd) print method