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* Fix ``css_files`` breakage from Sphinx ``1.6+`` update.
`158 <https://github.com/ryan-roemer/sphinx-bootstrap-theme/pull/158>`_,
`160 <https://github.com/ryan-roemer/sphinx-bootstrap-theme/pull/160>`_.
* **Breaking Change**: Remove ``bootswatch_css_custom`` override, and instead opt for documenting idiomatic Sphinx-version specific generic overrides for custom CSS.