fix date for FAZ
Translator APS.js: Fix for "PDF (free)"

Now recognises also "PDF (free)" button on website. Test case: http://journals.aps.org/pr/abstract/10.1103/PhysRev.69.37
Merge pull request #733 from Dominik-K/patch-1

Translator APS.js: Fix for "PDF (free)"
[APS] Fix regression from #733

cc @Dominik-K (`ZU.xpath` always returns an array)
Add translator for DigiZeitschriften
Merge pull request #732 from zuphilip/master

Add translator for DigiZeitschriften
change publication from FAZ.net to Frankfurter Allgemeine Zeitung
[IngentaConnect] Build PDF URLs from scratch
remove FAZ.NET debug (cc @ajlyon
Some PICA data improvements:
1. Remove u.a. from publisher and place
2. Grab only the number for editions
3. Don't grab numberOfVolumes when it's 1
more PICA improvements: 1. Deal with institutional authors; 2. Remove year clutter for all years, including those imported from COinS.
[BibTeX] Handle various forms of file attachment data
Closes #734
Re https://forums.zotero.org/discussion/35909/bibtex-import-from-citavi-including-pdf-attachments/
and https://forums.zotero.org/discussion/28347/unable-to-get-pdfs-stored-on-computer-into-zotero-standalone/
Merge pull request #735 from aurimasv/bibtex-filepath

[BibTeX] Handle various forms of file attachment data
[BibLaTeX] Update file attachment export as per #735
add OpenEdition Books. closes https://github.com/zotero/translators/pull/691