Notifications!

1. Notifications will now work properly
1.1. Added a default icon
1.2. Added a unique id based on the user id
1.3. Added a better timestamp.
1.4. Added an actual intent
1.5. Clicking a notification will now delete it
2. Added a menu item 'notification' in UserListActivity to simulate a
incoming MeetMe!-message

The user gets a new notification seperated from others for every
MeetMe!-message from different users.
Several MeetMe!-messages from the same user will generate only one
notification. Older ones will be replaced by the new ones, the latest
timestamp will be shown.
Merge branch 'master' of https://github.com/Seeem/MeetMe

Conflicts:
	MeetMe/bin/MeetMe.apk
	MeetMe/bin/classes.dex
	MeetMe/bin/classes/de/hfu/meetme/views/UserListFragment$1.class
	MeetMe/bin/classes/de/hfu/meetme/views/UserListFragment$2.class

	MeetMe/bin/classes/de/hfu/meetme/views/UserListFragment$NetworkTask.class
	MeetMe/bin/classes/de/hfu/meetme/views/UserListFragment.class
	MeetMe/bin/resources.ap_