[Elisa-commits] [MERGE] replace observables with bindable models

[Benjamin Kampmann]

This patch adds the bindable under core/utils and uses them in the model.
It also removes all the observable part (the media providers are probably
broken because of missing imports now).

As we are about the change the Controllers and Views anyway, I didn't
reimplement the automatic binding on model__set and controller__set.
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