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
user interface for notification search
User can select a search in profile, so that (later) he can be notified if a new ad matches his selection
in user profile you can select a search, so that later you get notified if a new ad matches your selection