implemented persistent notifications settings activity with card layout

git-svn-id: http://notifications-widget.googlecode.com/svn/trunk@312 21922344-3934-ee51-d6e3-fd981ce84c01
implemented app specific settings with card layout
sort app specific settings by visibility + title

git-svn-id: http://notifications-widget.googlecode.com/svn/trunk@313 21922344-3934-ee51-d6e3-fd981ce84c01