log compound messages with timestamp and proper system flag

src/application.coffee

@@ -24,7 +24,7 @@ knex('config').select('value').where(key: 'uuid').then ([ uuid ]) ->
 	)
 
 exports.logSystemEvent = logSystemEvent = (message) ->
-	logger.log('[system] ' + message)
+	logger.log({ message, isSystem: true })
 
 exports.kill = kill = (app) ->
 	logSystemEvent('Killing application ' + app.imageId)

src/lib/logger.coffee

@@ -1,3 +1,4 @@
+_ = require 'lodash'
 Docker = require 'dockerode'
 PUBNUB = require 'pubnub'
 Promise = require 'bluebird'
@@ -24,8 +25,14 @@ publish = do ->
 
 		# Redefine original function
 		publish = (message) ->
+			if _.isString(message)
+				message = { message }
+
+			message.timestamp = Date.now()
+
 			# Stop pubnub logging loads of "Missing Message" errors, as they are quite distracting
-			message or= ' '
+			message.message or= ' '
+
 			pubnub.publish({ channel, message })
 
 		# Replay queue now that we have initialised the publish function