Added additional tests for the XMLParser

More tests have been added to ensure the XMLBoardGame parser is
functioning correctly.
Added additional XMLParser tests

More tests for XMLParser for boardgames.
More tests for XMLParser, focused on stats of BG

Additional tests written for the XMLParser, focusing on the statistics
objects returned within a boardgame.
Added additional tests and checked test data

Added some more unit tests and fiddled with the test data to ensure it
matched exactly what was expected.