Docker build and download updates

MANIFEST.in

docker_images/docker_tango_python/requirements.txt

.../unitgrade-docker/home/cs103/Report3_handin_5_of_10.token

docker_images/unitgrade-docker/home/cs103/homework1.py

docker_images/unitgrade-docker/home/cs103/report3.py

...ges/unitgrade-docker/home/cs103/report3_complete_grade.py

docker_images/unitgrade-docker/home/cs103/report3_grade.py

docker_images/unitgrade-docker/tmp/cs103/homework1.py

docker_images/unitgrade-docker/tmp/cs103/report3.py

...ages/unitgrade-docker/tmp/cs103/report3_complete_grade.py

docker_images/unitgrade-docker/tmp/cs103/report3_grade.py

.../instructor/week5/__pycache__/report1intro.cpython-38.pyc

examples/02631/instructor/week5/report1intro_grade.py

examples/02631/instructor/week5/unitgrade_data/Bacteria.pkl

...02631/instructor/week5/unitgrade_data/ClusterAnalysis.pkl

...2631/instructor/week5/unitgrade_data/FermentationRate.pkl

...2631/instructor/week5/unitgrade_data/RemoveIncomplete.pkl

examples/02631/students/week5/looping.py

examples/02631/students/week5/report1intro_grade.py

examples/02631/students/week5/unitgrade_data/Bacteria.pkl