Update README.md
Merge branch 'dev'

* dev: (26 commits)
  added request and response validation
  add the schema to incoming content types
  imports
  moved provider to own class
  missing annotation
  license headers
  test for application/json media type
  json validator
  validation exception handling
  fixed pasted code
  validator interface
  json schema dependencies
  Schema ID's
  made geometry factory transient
  fixed track parsing
  commented logging
  fixed measurements resource
  implemented tracks of a user
  log mapped exceptions
  removed fixme
  ...
verbose reponse validation