message: copyright spans
diff: COPYRIGHT
  All contributions by the University of California:
  -Copyright (c) 2014, 2015, The Regents of the University of California (Regents)
  +Copyright (c) 2014-2017 The Regents of the University of California (Regents)
  All rights reserved.
  All other contributions:
  -Copyright (c) 2014, 2015, the respective contributors
  +Copyright (c) 2014-2017, the respective contributors
  All rights reserved.
  Caffe uses a shared copyright model: each contributor holds copyright over
  