Merge pull request #1 from TEIC/master

merge markdown
Merge remote-tracking branch 'upstream/master'
Syncing
sciencejournal test
Merge remote-tracking branch 'upstream/master'
sciencejournal
teitohtml omit empty ref elements not containing @target
tei-to-html empty refs
sciencejournal cleanup
sciencejournal cleanup
sciencejournal cleanup
sciencejournal cleanup
Merge pull request #18 from tuurma/master

Sciencejournal fix