Merge branch 'dev' into 'f-mypy'

src/doc/tutorials/first_steps.rst

src/doc/tutorials/index.rst

src/doc/tutorials/serverside.rst

src/linkahead/__init__.py

src/linkahead/apiutils.py

src/linkahead/cached.py

src/linkahead/common/__init__.py

src/linkahead/common/administration.py

src/linkahead/common/datatype.py

src/linkahead/common/models.py

src/linkahead/common/state.py

src/linkahead/common/timezone.py

src/linkahead/common/utils.py

src/linkahead/common/versioning.py

src/linkahead/configuration.py

src/linkahead/connection/__init__.py

src/linkahead/connection/authentication/__init__.py

src/linkahead/connection/authentication/auth_token.py

...onnection/authentication/external_credentials_provider.py

src/linkahead/connection/authentication/input.py