content views - add a portlet to the dashboard for content views

This pr contains changes to add a portlet to the dashboard for content views.  The portlet will be similar to what is available for promotions.
    
It will essentially list the last N (e.g. 5) content view publish/refresh attempts.  Indicating 'publishing' or 'refreshing' while the view action is being performed.  Once it is finished, it will display success/failure with a timestamp.  The user may also click on the view name (if they have permissions) and be redirected to to the content view definition where that view exists.