Change how goodread import writes reviews

- adds published date
 - broadcasts review imports
 - completes review and shelve actions as it goes
 - some small connector fixes

 fixes #247

bookwyrm/views.py

@@ -489,7 +489,8 @@ def book_page(request, book_id):
         ).values_list('identifier', flat=True)
 
         readthroughs = models.ReadThrough.objects.filter(
-            user=request.user
+            user=request.user,
+            book=book,
         ).order_by('start_date')