Fixed issue where notifications view would persistently show refresh control
Added ability to add button to WPNoResultsView
Added ability to add button to WPTableViewController no results view
Web view controller hides tab bar when pushed
Added message explaining Jetpack to notifications tab for self-hosted users
Created const for inline string
Changed WPNoResultsView delegate method name
Removed unnecessary delegate code from WPNoResultsView
Merge pull request #725 from wordpress-mobile/issues/720-notification-jetpack-ui

#720 - add message explaining Jetpack to notifications tab