Merge branch 'fix/couchdb_update_commit_things' into 'master'

README.md

aas/backend/couchdb.py

aas/examples/tutorial_backend_couchdb.py

aas/examples/tutorial_storage.py

requirements.txt

setup.py

test/_helper/test_helpers.py

test/backend/test_backends.py

test/backend/test_couchdb.py

test/examples/test_tutorials.py