discourse/discourse — pull request #1448 by velesin (2013-09-18 16:50:59+00:00)
Title: Remove duplicate mixing in of Discourse.Presence

AdminEmailIndexController and AdminEmailPreviewDigestController explicitely mix in Discourse.Presence, but they extend base classes Discourse.Controller and Discourse.ObjectController that already mix in Discourse.Presence, so this explicit inclusion is redundant.