Structure 

     elisa
        plugins
          some_plugin
             models
             controllers
             views
               elements
             plugin_controller.py
             plugin_model.py
        models
          data_sources
        controllers
          components [ reusable blocks of controller logic avaiable to controllers when specified ] 
        views
          elements  [ mini reusable views for any view ]
     app_controller.py
     app_model.py