fixed invalid sensor creation schema
fixed 500 ISE when not submitting any entity
fixed NPE for not anonymous users
more fine grained access rights
enforce rights while encoding tracks
enforce access restrictions in resources
Merge branch 'dev' into rights

* dev:
  fixed 500 ISE when not submitting any entity
  fixed invalid sensor creation schema
anonymize measurements
do no anonymize sensors
even more restrictions
rules for root resource listings