old_contents: 
  presenters = ["basic", "image", "sound", "map", "pdf"]
  
new_contents: # This file is part of PyBOSSA.
  #
  # PyBOSSA is free software: you can redistribute it and/or modify
  # it under the terms of the GNU Affero General Public License as published by
  # the Free Software Foundation, either version 3 of the License, or
  # (at your option) any later version.
  #
  # PyBOSSA is distributed in the hope that it will be useful,
  # but WITHOUT ANY WARRANTY; without even the implied warranty of
  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  # GNU Affero General Public License for more details.
  #
  # You should have received a copy of the GNU Affero General Public License
  # along with PyBOSSA.  If not, see <http://www.gnu.org/licenses/>.
  
  presenters = ["basic", "image", "sound", "map", "pdf"]
  
subject: add copyright boilerplate