Allow access to docnames from filter expressions.
Fix tinker test for new API.
Fix filter syntax error test.
Fix another test.
Use python setup.py develop to install, so coveralls can find source on github.
Back to full coverage.
Revert "Use python setup.py develop to install, so coveralls can find source on github."

Did not help coveralls, not sure what is wrong.

This reverts commit 9ece3c6d318c64165ceff3ebe4d0ce424af512ef.
Add test from @bk322 (see issue #62).
In regression test for local bibliographies, check references and citations in full detail.
Fix pep8 issues.
Document backward incompatible change. [ci skip]
Support docname in :filter:.
Use docname in regression test for issue #62.
Add support for set literals and set operations in filter expressions and update documentation.
Full code coverage.
Also drop py26 support (it has no set literals).
Changelog update.
Merge pull request #63 from mcmtroffaes/feature/local-bibliographies

Support local bibliographies.