Added a service to the backend to verify session validity. Removed http interceptor.
minor changes

- post setting & option is collapsed per default
Bugfix.

- userService not needed in the owner app
Bugfix.

- userService not needed in the owner app
SaveDraft

- drafts can now be saved on the server as JSONLD string
SaveDraft

- draftURI added
SaveDraft

- server side processing of save draft
- draftURI is now being mapped to a user
- use draftURI to retrieve drafts from draftrepository
SaveDraft

- new post drop down menu displays the drafts, links are not completely functional yet.
- postbox now displays drafts. dates are missing
Merge branch 'devel' of https://github.com/researchstudio-sat/webofneeds into devel

Conflicts:
	webofneeds/won-owner-webapp/src/main/java/won/owner/web/websocket/WonWebSocketHandler.java
Merge branch 'devel' into feat-saveDraft
Bugfix

save draft bugfix
Merge branch 'devel' into feat-privatelink
improved handling of concurrent data requests
Private Link Connect

- event is removed from the match lists if connversation request is made
- event is shown as outgoing request
added ReadUpdateLock to avoid conflicts between linked data refresh and local read
added simple cache management (no removal yet) for linked data uris
Merge branch 'devel' of https://github.com/researchstudio-sat/webofneeds into devel
minor changes

- private link view changes
Private link GUI

- Request lists reacts to message click
- other minor changes
Merge branch 'devel' into feat-postbox