Fix DeviceTrack in the TestsHelper.
Add documentation about tracks and fix the DeviceTrack data format.
Small doc fixes.
Merge remote-tracking branch 'origin/topic/bf_fix_tracks_text_helper' into develop

* origin/topic/bf_fix_tracks_text_helper:
  Small doc fixes.
  Add documentation about tracks and fix the DeviceTrack data format.
  Fix DeviceTrack in the TestsHelper.
Set ruby version.
Update ragen_bay for tests.
Release version v0.2.5-rc029.