old_contents: #
  # Copyright 2011, Blender Foundation.
  #
  # This program is free software; you can redistribute it and/or
  # modify it under the terms of the GNU General Public License
  # as published by the Free Software Foundation; either version 2
  # of the License, or (at your option) any later version.
  #
  # This program 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 General Public License for more details.
  #
  # You should have received a copy of the GNU General Public License
  # along with this program; if not, write to the Free Software Foundation,
  # Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  #
  
  # <pep8 compliant>
  
  bl_info = {
      "name": "Cycles Render Engine",
      "author": "",
      "version": (0, 0),
      "blender": (2, 6, 0),
      "api": 41670,
      "location": "Info header, render engine menu",
      "description": "Cycles Render Engine integration.",
      "warning": "",
      "wiki_url": "http://wiki.blender.org/index.php/Dev:2.6/Source/Render/Cycles",
      "tracker_url": "",
      "support": 'OFFICIAL',
      "category": "Render"}
  
  import bpy
  from . import ui, properties, engine, presets
  
  
  class CyclesRender(bpy.types.RenderEngine):
      bl_idname = 'CYCLES'
      bl_label = "Cycles Render"
      bl_use_shading_nodes = True
  
      def __init__(self):
          engine.init()
          self.session = None
  
      def __del__(self):
          engine.free(self)
  
      # final render
      def update(self, data, scene):
          engine.create(self, data, scene)
          engine.update(self, data, scene)
  
      def render(self, scene):
          engine.render(self)
  
      # preview render
      # def preview_update(self, context, id):
      #    pass
      #
      # def preview_render(self):
      #    pass
  
      # viewport render
      def view_update(self, context):
          if not self.session:
              engine.create(self, context.blend_data, context.scene,
                  context.region, context.space_data, context.region_data)
          engine.update(self, context.blend_data, context.scene)
  
      def view_draw(self, context):
          engine.draw(self, context.region, context.space_data, context.region_data)
  
  
  def register():
      properties.register()
      ui.register()
      presets.register()
      bpy.utils.register_module(__name__)
  
  
  def unregister():
      ui.unregister()
      properties.unregister()
      presets.unregister()
      bpy.utils.unregister_module(__name__)
  
new_contents: #
  # Copyright 2011, Blender Foundation.
  #
  # This program is free software; you can redistribute it and/or
  # modify it under the terms of the GNU General Public License
  # as published by the Free Software Foundation; either version 2
  # of the License, or (at your option) any later version.
  #
  # This program 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 General Public License for more details.
  #
  # You should have received a copy of the GNU General Public License
  # along with this program; if not, write to the Free Software Foundation,
  # Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  #
  
  # <pep8 compliant>
  
  bl_info = {
      "name": "Cycles Render Engine",
      "author": "",
      "version": (0, 0),
      "blender": (2, 6, 0),
      "location": "Info header, render engine menu",
      "description": "Cycles Render Engine integration.",
      "warning": "",
      "wiki_url": "http://wiki.blender.org/index.php/Dev:2.6/Source/Render/Cycles",
      "tracker_url": "",
      "support": 'OFFICIAL',
      "category": "Render"}
  
  import bpy
  from . import ui, properties, engine, presets
  
  
  class CyclesRender(bpy.types.RenderEngine):
      bl_idname = 'CYCLES'
      bl_label = "Cycles Render"
      bl_use_shading_nodes = True
  
      def __init__(self):
          engine.init()
          self.session = None
  
      def __del__(self):
          engine.free(self)
  
      # final render
      def update(self, data, scene):
          engine.create(self, data, scene)
          engine.update(self, data, scene)
  
      def render(self, scene):
          engine.render(self)
  
      # preview render
      # def preview_update(self, context, id):
      #    pass
      #
      # def preview_render(self):
      #    pass
  
      # viewport render
      def view_update(self, context):
          if not self.session:
              engine.create(self, context.blend_data, context.scene,
                  context.region, context.space_data, context.region_data)
          engine.update(self, context.blend_data, context.scene)
  
      def view_draw(self, context):
          engine.draw(self, context.region, context.space_data, context.region_data)
  
  
  def register():
      properties.register()
      ui.register()
      presets.register()
      bpy.utils.register_module(__name__)
  
  
  def unregister():
      ui.unregister()
      properties.unregister()
      presets.unregister()
      bpy.utils.unregister_module(__name__)
  
subject: remove api from addon bl_info, was never used.