Merge pull request #1628 from apletnev/#1581

Add Statistic plugin (#1581 Amount of hours spent on a book)

frontend/document/credocument.lua

@@ -156,6 +156,10 @@ function CreDocument:getCoverPageImage()
     end
 end
 
+function Document:getProps()
+        return self._document:getDocumentProps()
+end
+
 function CreDocument:getWordFromPosition(pos)
     local word_box = self._document:getWordFromPosition(pos.x, pos.y)
     DEBUG("CreDocument: get word box", word_box)