EvilQuery for Participation, refactor comment creation

app/controllers/comments_controller.rb

app/models/user.rb

lib/evil_query.rb

lib/stream/comments.rb

lib/stream/likes.rb

spec/controllers/comments_controller_spec.rb

spec/controllers/jasmine_fixtures/aspects_spec.rb

spec/controllers/likes_controller_spec.rb

spec/controllers/people_controller_spec.rb

spec/integration/account_deletion_spec.rb

spec/integration/dispatching_spec.rb

spec/integration/receiving_spec.rb

spec/lib/evil_query_spec.rb

spec/lib/statistics_spec.rb

spec/mailers/notifier_spec.rb

spec/misc_spec.rb

spec/models/comment_spec.rb

spec/models/notification_spec.rb

spec/models/photo_spec.rb

spec/models/post_spec.rb