Added unit test for Calculator
Added unit tests for XML Input
Refactored ConsoleIOHandler to take generic TextReader/Writer paramater to support other potential stream readers/writers
Added tests for XML Writing
Added tests for argument parsing
Refactored program to be more testable
FibonacciCalculator logic is now split into multiple implementations
Removed attributes for categories in favor of class names
Added tests to execute program frlow
Tested program flow logic