add initial test
add difference method that finds the difference between the square of the sum of the numbers and the sum of the squares of the number
fix loop in smallest_multiple
add method that sums of all squares of numbers leading up to given initial number
fix naming of methods, add method that finds the square of the sum
find difference for first 100 natural numbers
Merge pull request #6 from anniesing/sum-square-difference

Sum square difference