Handle description on cybox Object class

[rpiazza]

The code says it doesn't support this. The slider needs a place to put STIX 2.0 properties that can't be represented

[gtback]

Could you put it on the Description of the Observable instead? If not, we could add it to Object as well (it shouldn't be too hard, since it subclasses mixbox.Entity).

[rpiazza]

That sounds like a good solution.

[gtback]

I'm going to leave this open, but remove it from the v2.1.0.15 milestone, since it should be pretty easy. For the slider, we can stick with the Observable description option.

[rpiazza]

Actually, it would be a lot better for the slider to able to attach missing properties to the Object, because when it is noticed missing the Observable isn't available without changing a lot of code.

[gtback]

Ok, I'll put it back in a milestone.