Merge branch 'develop'

obis/src/python/HOWTO_UPLOAD_TO_PYPI

obis/src/python/LICENSE

obis/src/python/MANIFEST.in

obis/src/python/README.md

obis/src/python/obis/__init__.py

obis/src/python/setup.py

pybis/src/python/CHANGELOG.md

pybis/src/python/notebooks/pybis demo.ipynb

pybis/src/python/pybis/attribute.py

pybis/src/python/pybis/definitions.py

pybis/src/python/pybis/experiment.py

pybis/src/python/pybis/property_assignment.py

pybis/src/python/pybis/sample.py

pybis/src/python/pybis/vocabulary.py

pybis/src/python/setup.py