Add Bounty Hunter and Sith tags to asajj ventress plz!

The Sith tag is the stronger claim, as you'd probably need a separate Asajj Ventress Bounty Hunter version. But as has been pointed out with the R2 thing, there's really very little consistency here. I'm less keen on seeing loads of character variants (it's pretty crazy with all of the Han's... ) but well I doubt in this case there's much demand for an AV BH from an expenditure perspective so the whole thing is fairly redundant