Updated park and rides provider to use KVService
Merge branch 'master' of github.com:ox-it/moxie

* 'master' of github.com:ox-it/moxie:
  Moved download_file into moxie.core.tasks
  Expose files in representation
  Corrected property name
  Do not store the full path in the index
  Only import images if static files dir has been defined
  Added file_type
  Extracted method to fetch images
  OxPoints formatting: optionnally choose the separator
  Fix task syntax (celery 3.0 style)
  Fix permission on task to allow file overwrite
  Handle network errors
  Initial OxPoints downloading files
  Updated task to handle not existing directory path
  Basic task to download a file to a given location