Release checklist

1. nosetests tests
2. update versions: __version__ in __init__.py
3. update Makefile for docker versions
4. add new libraries into README.md
5. check requirements.txt if new libraries/dependencies should be added
6. python ci/environments_generate.py
7. check consistency of requirements.txt with ci/*.yaml
8. update docs, cd docs/ && make html push them to branch gh-pages
9. make a tag for master and for docker