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:Date: 2018-10-21
* Remove ability to add the warning banner statically
* Make the banner more customizable (all the configs are included in the ``json`` file generated and available from Javascript)
* Rename ``versionwarning_default_admonition_type`` by ``versionwarning_admonition_type``
* Rename ``versionwarning_body_default_selector`` by ``versionwarning_body_selector``
* Remove ``versionwarning_body_extra_selector``
* Refactor the code to avoid potential circular imports
* Filter Read the Docs versions by ``active=True`` when retrieving versions