kivy/kivy — pull request #960 by Rio (2013-02-13 10:23:54+00:00)
Title: Expose on load from Video class

Needed a way to switch from a loading screen to the video screen using a ScreenManager.
the kivy.uix.video.Video class didn't provide a clean way of checking if the video was loaded or not. Exposed it through a BooleanProperty.