pylint check for the projector app
flake8 for agenda
used isort on agenda app
flake8 and isort on the assignment app
flake8 and isort for the config app
flake8 and isort for core
flake8 and isort for mediafile
flake8 and isort for motion
flake8 and isort for participant
isort for poll
flake8 and isort for projector
flake8 and isort for utils
flake8 and isort for global files
flake8 for tests
fixed travis