Next dev version.
Autodoc fix for check_duplicate_labels.
Add test to reproduce issue #15.
Implement citation entry sorting for unsorted styles (see issue #15).
Require oset 0.1.3 (fixes Python 3.x issues).
Merge branch 'feature/citation_order' into develop

This resolves issue #15.
Version bump.
Changelog update.
Skip citation label warnings on Sphinx [source] links.
Changelog update.
Test for issue #17.
Improve detection of source links for issue #17.
Comment fix.
Merge branch 'feature/sphinx_source_links' into develop
Version bump.
Some improvements for general sphinx test.
Prepare release.
Add travis CI support.
No Python 3.1 on travis servers.
Also install Tinkerer (needed to run tests).