failing  test for AnEmptyStringReturnsZero
failing test now compiles (still fails)
AnEmptyStringReturnsZero now passes
added failing test for ANumericStringReturnsNumber
ANumericStringReturnsNumber now green
ignore *.user files
added failing test for TwoNumbersCommaDelimited_ReturnsTheSum
TwoNumbersCommaDelimited_ReturnsTheSum is now passing
refactor
added failing test for TwoNumbersNewLineDelimited_ReturnsTheSum
TwoNumbersNewLineDelimited_ReturnsTheSum is now passing
refactor
ThreeNumbersDelimitedEitherWay_ReturnsSum is now passing
refactor
failing test for AnyNegativeNumbers_ThrowsAnException
AnyNegativeNumbers_ThrowsAnException is now green
refactor
simplified unit tests
failing test for NumbersGreaterThan1000_ShouldBeIgnored
NumbersGreaterThan1000_ShouldBeIgnored is now passing