added local GeoJSON geometry schema
renamed identifier property
fixed incorrect constant
additional validation for measurements
do not save id/created/modified for measurement values
save optional track in measurements
fixed endless recursion due incorrect method call
add track/user to created measurements
renamed identifier property
add created measurements to track
measurement encoding/decoding
throw 404 for invalid measurement identifier
throw 404 for measurements that are not in the track
catch IAE for invalid ObjectIDs
fixed get measurement by id
removed auth annotation for GET methods
activated jersey logging filter
disabled logging filter
Merge branch 'dev'

* dev:
  disabled logging filter
  activated jersey logging filter
  removed auth annotation for GET methods
  fixed get measurement by id
  catch IAE for invalid ObjectIDs
  throw 404 for measurements that are not in the track
  throw 404 for invalid measurement identifier
  measurement encoding/decoding
  add created measurements to track
  renamed identifier property
  add track/user to created measurements
  fixed endless recursion due incorrect method call
  save optional track in measurements
  do not save id/created/modified for measurement values
  additional validation for measurements
  fixed incorrect constant
  renamed identifier property
  added local GeoJSON geometry schema