removed unused rendering methods in model
replaced note.video by note.media_item (need backend controller change)
Merge branch 'develop' of https://github.com/koemei/koemei-widget into develop

# By Renato S. Martins
# Via Renato S. Martins
* 'develop' of https://github.com/koemei/koemei-widget:
  added connect task to launch server on port 8000