Added support for Zotero.
Merge branch 'develop' of github.com:lucastheis/django-publications into develop

Conflicts:
	publications/models/publication.py
Fixed change list import bibtex link
Added needed BibTeX fields to Publication. Added bibtex_optional and bibtex_required fields to Type and rewrote respective admin bits to allow selectively showing fields to an existing entry. Added initial data to fixtures to allow @online entry.
Merge pull request #1 from cazgp/develop

Revamp and allow @online