Merge upstream changes

beat/web/experiments/models.py

beat/web/experiments/serializers.py

beat/web/experiments/static/experiments/js/panels.js

beat/web/experiments/static/experiments/js/utils.js

beat/web/experiments/templates/experiments/view.html

beat/web/toolchains/static/toolchains/js/common.js

beat/web/toolchains/static/toolchains/js/editor.js

beat/web/toolchains/static/toolchains/js/models.js

beat/web/toolchains/static/toolchains/js/viewer.js

buildout.cfg