[controller] publish safe config

[API] Index 'like' queries and use for search

[Workbench] Show number of queued containers on dashboard (instead of busy/idle nodes)

[arvados-dispatch-cloud] Error-counting metrics

Update to Ruby 2.5 - 2.3 is going EOL

list arvados-python-client external deps for "pip install"

Support building of documentation for each stable release

[Documentation] Add Python SDK recipe on how to get a container request's real state

Add flag to arv-put to set a trash_at date

[API] Ensure 0 and false are accepted as false for boolean params in a www-form-encoded body or query string, if they were in rails4.