Updated Notificationcenter. Now shown in header. Not really good design.
Links only work to bookmarks. Please see Email from 3.11.14 for further info.
Notifications are not yet deleted after showing. but are marked as read (seen).
Merge branch 'master' of https://github.com/ese-unibe-ch/ese2014-team5

Conflicts:
	Skeleton/src/main/java/org/sample/controller/IndexController.java