Show a loading animation if there is no record

This looks better than empty cards. The animation is only visible when
there is no record (when both anime- and mangaRecord are null).
Small cleanup

- search_item.xml is not used, so delete it
- there was no need for the RelativeLayout in
  card_detailview_synopsis.xml
Fix NPE when Add to list is pressed before the record is loaded
Fix manga rating not saved
Fixed Android Beam in DetailView
Simplify SwipeRefresh processing

As the onRefresh() callbacks on both fragments have done the same
(calling a function in the host Activity), the Activity can handle the
callbacks directly.
Merge pull request #250 from d-sko/dv_loading_indicator

Minor DetailView changes