I can't find it! I was positive I read it on their website (as opposed to hearing it second hand) but can no longer find any information on extra points for graduate degrees. I thought the policy was 1 extra point for a Master's, 4 extra points for a PhD.
However, that isn't coming up anywhere on their website so maybe they either changed their policy or I mixed up information from different schools when I was comparing a lot of institutions for the 2015/2016 application cycle. So sorry - if anyone else can confirm whether such a policy exists or has changed, I would appreciate it.