Added parser to retrieve Ingredients from CSV files. includes tests. toString method for Ingredients. new NutritionTable constructor to create objects from List<Double>.

added more validation to Recipe constructor, fixing bugs in RecipeSearch, tests for RecipeSearch. now adding full recipes to the shopping list

testing shopping list, modified RecipeComponent interface: added a new method getMeasurement(). fixed logging

implemented algorithm to calculate nutrition tables for recipes from their ingredients -> added tests.
implemented equals() method for NutritionTable -> added tests.

slight refactoring...

changed Categories to CategoryManager and added IngredientManager with respective methods (partly moved from RecipeManager to IngredientManager)

added tests to categories: they should not be created with a name that is "", null and only be created with a color code where 0 <= code <= 0xFFFFFF