anchor.diff:            title: "All time",
             ytitle: "minutes",
             colors: [Document.color],
  -          suffix: " minutes"
  +          suffix: " minutes",
  +          download: true
           %>
           <br />
           <div class="center">
  
positive.code:           pie_chart @documents.where.not(cached_word_count: [0, nil]).pluck(:title, :cached_word_count),
              suffix: ' words',
              legend: 'bottom',
              donut: 'true'
          %>
        </div>
      </div>
  
negative.code:           bar_chart current_user.documents.joins(:document_revisions)
                .group('document_revisions.document_id')
                .pluck('documents.title, count(document_revisions.document_id)'),
              suffix: ' revisions',
              download: true
          %>
        </div>
      </div>
  