Work management changes

1. Remove management (half implemented) of the saved models view. This
will be managed in separate view, so one can call the same view also
from Intro page
2. Fix on LogIn Success/Failure management
3. Before returning all saved models of the user, group them by ID
(session)
4. On first save set of the current model, send image too.
5. Fixes on model-view bindings management with knockout
6. Add screenshot.js for taking screen shots from THREE.js