Comcast’s Xfinity spoke to Ashley Greene not too long ago about her portrayal of the Cullen’s most vibrant family member, Alice Cullen and how she feels now that she has to say goodbye to Alice and ‘The Twilight Saga’.   David Onda: So, this is the end! You finally made it to the finale of this whole saga. It must be very bittersweet for you. Ashley Greene: Um, it definitely is. I think that’s…