Hard Probes 2015 proceedings (Bottomonium in A+A)

Talk: https://drupal.star.bnl.gov/STAR/presentations/hard-probes-2015/robert-vertesi

v1: for PWG review
v2: Daniel's comments incorporated
v3: after Zhenyu's and Hao's comments, still discussed in PWG, to be submitted to startalks
v4: on Startalks, Gang's and Jana's comments incorporated
v5: reviewed version after Referee's comments