Remove client-side Action Cable debugging code

Added to aid in developing Action Cable, but isn't neccessary for production operation.

actioncable/lib/assets/javascripts/action_cable/connection.coffee

@@ -79,6 +79,3 @@ class ActionCable.Connection
     return if @disconnected
     @disconnected = true
     @consumer.subscriptions.notifyAll("disconnected")
-
-  toJSON: ->
-    state: @getState()

actioncable/lib/assets/javascripts/action_cable/connection_monitor.coffee

@@ -69,11 +69,6 @@ class ActionCable.ConnectionMonitor
           @consumer.connection.reopen()
       , 200
 
-  toJSON: ->
-    interval = @getInterval()
-    connectionIsStale = @connectionIsStale()
-    {@startedAt, @stoppedAt, @pingedAt, @reconnectAttempts, connectionIsStale, interval}
-
   now = ->
     new Date().getTime()
 

actioncable/lib/assets/javascripts/action_cable/consumer.coffee

@@ -23,9 +23,3 @@ class ActionCable.Consumer
 
   send: (data) ->
     @connection.send(data)
-
-  inspect: ->
-    JSON.stringify(this, null, 2)
-
-  toJSON: ->
-    {@url, @subscriptions, @connection, @connectionMonitor}

actioncable/lib/assets/javascripts/action_cable/subscriptions.coffee

@@ -9,7 +9,6 @@
 class ActionCable.Subscriptions
   constructor: (@consumer) ->
     @subscriptions = []
-    @history = []
 
   create: (channelName, mixin) ->
     channel = channelName
@@ -57,22 +56,9 @@ class ActionCable.Subscriptions
     for subscription in subscriptions
       subscription[callbackName]?(args...)
 
-      if callbackName in ["initialized", "connected", "disconnected", "rejected"]
-        {identifier} = subscription
-        @record(notification: {identifier, callbackName, args})
-
   sendCommand: (subscription, command) ->
     {identifier} = subscription
     if identifier is ActionCable.INTERNAL.identifiers.ping
       @consumer.connection.isOpen()
     else
       @consumer.send({command, identifier})
-
-  record: (data) ->
-    data.time = new Date()
-    @history = @history.slice(-19)
-    @history.push(data)
-
-  toJSON: ->
-    history: @history
-    identifiers: (subscription.identifier for subscription in @subscriptions)