Added week7

cp/ex07/__init__.py

cp/ex07/astronomical_season.py

cp/ex07/box_packing.py

cp/ex07/code_shift.py

cp/ex07/have_equal_length.py

cp/ex07/last_difference.py

cp/ex07/morse_to_text.py

cp/ex07/returning_multiple_values.py

cp/ex07/rgb_to_hue.py

cp/project3/project3_grade.py

cp/project3/unitgrade_data/WaterHeight.pkl

cp/project3/unitgrade_data/Week05BestBuy.pkl

cp/project3/unitgrade_data/Week05TicTacToeGetGameState.pkl

cp/project3/unitgrade_data/Week05TicTacToePrintBoard.pkl

cp/project3/unitgrade_data/Week05TicTacToeUpdateBoard.pkl

cp/project3/unitgrade_data/Week06MultiTap.pkl

cp/project3/unitgrade_data/Week06SpellCheck.pkl

cp/tests/tests_week07.py

cp/tests/unitgrade_data/Week07AstronomicalSeason.pkl

cp/tests/unitgrade_data/Week07BoxPacking.pkl