when 5 minute category refresh happens the refresh control should be visible.
Show refresh control when reachability is triggered.
Removed updateLoadingCell.  Already implemented in superclass.  This method interrupts loading cell update in search.
only check if refresh control is refreshing inside addOperationWithBlock
Merge pull request #251 from MIT-Mobile/3.6/news-Oct23-Updates

3.6/news oct21 updates