Added Channel.Purpose on the server

api/slackimport.go

@@ -182,7 +182,7 @@ func SlackAddChannels(teamId string, slackchannels []SlackChannel, posts map[str
 			Type:        model.CHANNEL_OPEN,
 			DisplayName: sChannel.Name,
 			Name:        SlackConvertChannelName(sChannel.Name),
-			//Purpose:      sChannel.Topic["value"], // TODO uncomment this once Channel.Purpose is a field
+			Purpose:     sChannel.Topic["value"],
 		}
 		mChannel := ImportChannel(&newChannel)
 		if mChannel == nil {