Merge pull request #7 from splattater/develop

Abstract subscription to resources (instead of feed)
Merge pull request #11 from splattater/develop

Add method _getNameByLinkedData to NameHelper
Improvements in UserController

- introduce new getUserForPerson method
- add Person to Xodx_User in getUser
- deprecate getUserUri
Use new LinkeddataHelper

- forward Saft to use new Helpers
- replace invocations of Saft_Tools with Helper
Fix #10. Implement LogoutAction
Fix #9. Invalidate model after deletion.
Fix #12. Fix replying activities

Add default object-type to activity:target in feed.phtml
minor fix displaying activity object type in streams
change name of variable subResource to subscriptionResource