In soc.views.models.notification module remove unused imports, add missing white space, change list() method definition to comply with base View list() method declaration. Add missing Meta class docstring.
Patch by: Pawel Solyga
indexes:
# AUTOGENERATED
# This index.yaml is automatically updated whenever the dev_appserver
# detects that a new type of query is run. If you want to manage the
# index.yaml file manually, remove the above marker line (the line
# saying "# AUTOGENERATED"). If you want to manage some indexes
# manually, move them above the marker line. The index.yaml file is
# automatically uploaded to the admin console when you next deploy
# your application using appcfg.py.