Merge branch 'dev'
map -> set
phenomenons and sensors
moved BCrypt encoder to new util package
moved BCrypt encoder to new util package
encoding of creation and modification date of track
interface for geometry converters (JSON & BSON)
license headers
deparameterized measurement value
phenomenon provider
phenomenons provider
sensors provider
measurement provider
license header
index for bbox
identifier for measurements
measurements provider
include measurement indentifier in JSON
replaced users by user
restructured track provider