Merge branch 'f-identifiable' into 'dev'

CHANGELOG.md

README.md

README_SETUP.md

integrationtests/basic_example/test_basic.py

setup.cfg

src/caoscrawler/crawl.py

src/caoscrawler/identifiable.py

src/caoscrawler/identifiable_adapters.py

src/caoscrawler/identified_cache.py

src/doc/README_SETUP.md

src/doc/concepts.rst

src/doc/index.rst

unittests/test_cache.py

unittests/test_file_identifiables.py

unittests/test_identifiable.py

unittests/test_identifiable_adapters.py

unittests/test_identified_cache.py

unittests/test_tool.py