Log Message:
py-sphinxcontrib-bibtex: updated to 0.4.1

0.4.1:
* Disable tinkerer test due to upstream bug.
* Remove crossref test due to changed upstream behaviour in pybtex.
* Fix latex test to match new upstream code generation.
* Fix documentation of encoding option.
* Migrate to sphinx.util.logging in favour of old deprecated logging
  method.