1. Purge persistent notifications from no longer running services.
2. fixed collect on locked when screen is turned on and stay locked.
3. Doesn't clear notifications from running app if the device is locked.

git-svn-id: http://notifications-widget.googlecode.com/svn/trunk@154 21922344-3934-ee51-d6e3-fd981ce84c01
Purge notifications from background process too. (not services)

git-svn-id: http://notifications-widget.googlecode.com/svn/trunk@155 21922344-3934-ee51-d6e3-fd981ce84c01