the NeedCreatorBot now also can import needs in TRIG and TTL format

needproducer-mixed.xml specifies loading needs from mails dir as before, and additionally from trig dir
Merge remote-tracking branch 'origin/devel' into devel
add property for specifying directories with needs in turtle and trig formats
need producer uses producer from turtle format instead of trig  (see #64)

fix ModelRdfFileWriter to produce turtle instead of trig
in needproducer-mixed.xml specify loading needs both from mails dir and from turtle dir
in needproducer-trig.xml use file filter regex .*trig
MessageService generates event objects from incoming messages
Merge branch 'devel' into feat-yim
Merge branch 'devel' into feat-yim
fixed a typo
Merge branch 'devel' into feat-linkeddata-js

Conflicts:
	webofneeds/won-owner-webapp/src/main/webapp/index.jsp
	webofneeds/won-owner-webapp/src/main/webapp/scripts/rdfstore-js/rdf_store.js
Migration to Angular.js version 1.2.23.
minor changes.

- save draft bug fix
- create need events
Merge branch 'devel' into feat-yim

Conflicts:
	webofneeds/won-owner-webapp/src/main/webapp/app/post-detail/post-detail.js
need creation
Merge branch 'devel' into feat-linkeddata-js
minor changes.
Merge branch 'devel' into feat-yim

Conflicts:
	webofneeds/won-owner-webapp/src/main/webapp/app/service/won-service.js
need creation
Merge branch 'devel' into feat-yim
Added constants for HintMessages
Working on Callback for different message types.