Added single Stats object returned per user, primary key is not username for Stats table

Addded activity to all methods on ObjService and search etc. addActivity() method then calls StatsService.save. If there is already a stat then we update it otherwise create new.
Merge branch 'master' of https://github.com/intesar/vChest

Conflicts:
	src/main/java/com/vmw/bora/vchest/rest/BucketRestService.java