Consolidate request handlers

[skyl]

Instead of having a different view for year, keyword, etc, I think it would make more since to filter by the querystring. So, we could see all of the papers from eg 2014 that are tagged curcumin and antifungal with say /publications/?year=2014&keyword=curcumin&keyword=antifungal&plain=yes. Currently this particular query is not possible on the frontend. This kind of search would be well suited for a querystring instead of url parameters. Moving all of this logic into a single view would be a significant cleanup, only once would we have to state, for instance:

    if 'plain' in request.GET:
        return render_to_response('publications/publications.txt', {
                'publications': publications
            }, context_instance=RequestContext(request), content_type='text/plain; charset=UTF-8')

And, a few redundant templates could probably go away.