Merge pull request #144 from LassiHaaranen/master

Added example exercise that has file attachments
Merge pull request #145 from LassiHaaranen/master

Only show assistant feedback when assistant grading is allowed
Merge pull request #146 from LassiHaaranen/master

Adding ExerciseWithAttachment from Teacher's view
Update README.md

Default port in settings.py is 8000, changed accordingly.
Update initial_data.json

Added 10 years to ending times.
Merge pull request #147 from LassiHaaranen/master

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