Merge branch 'web_fixes' into '1.4.x'

beat/web/algorithms/views.py

beat/web/code/models.py

beat/web/common/fields.py

beat/web/common/models.py

beat/web/common/serializers.py

beat/web/common/utils.py

beat/web/experiments/api.py

beat/web/experiments/models/experiment.py

beat/web/experiments/serializers.py

beat/web/navigation/templates/navigation/contact.html

beat/web/plotters/admin.py

beat/web/plotters/api.py

beat/web/plotters/serializers.py

beat/web/plotters/views.py

beat/web/search/serializers.py

beat/web/toolchains/views.py

beat/web/ui/templatetags/gravatar.py

beat/web/utils/management/commands/list_active_users.py