+ Code cleanup and refactoring in CanteenSupply
+ Totally refactored the Canteen tests to accomodate to the new way to add people to the checkout line
+ Implemented a simple CanteenSupply test case
+ ASCII fix
+ Implemented a new way to add people in line, so that it fetches articles from the canteen supply
+ Small code cleanups
+ Updated Article test unit to check for 'euros' instead of the euro-sign
+ Added some constants for a new canteen simulation implementation
+ Implemented a random supply generator
+ Implemented a method to fetch article names from the ARTICLE_NAMES constant
+ Refactored the CanteenSimulation to make use of the CanteenSupply