message: more references to Cisco Spark in readme
diff: @@ -216,7 +216,9 @@ controller.on('message_received', function(bot, message) {
  Due to the multi-channel, multi-user nature of Slack, Botkit does additional filtering on the messages (after firing message_received), and will fire more specific events based on the type of message - for example, `direct_message` events indicate a message has been sent directly to the bot, while `direct_mention` indicates that the bot has been mentioned in a multi-user channel.
  [List of Slack-specific Events](readme-slack.md#slack-specific-events)
  -Twilio IPM bots can also exist in a multi-channel, multi-user environmnet. As a result, there are many additional events that will fire. In addition, Botkit will filter some messages, so that the bot will not receive it's own messages or messages outside of the channels in which it is present.
  +Similarly, bots in Cisco Spark will receive `direct_message` events to indicate a message has been sent directly to the bot, while `direct_mention` indicates that the bot has been mentioned in a multi-user channel. Several other Spark-specific events will also fire. [List of Cisco Spark-specific Events](readme-ciscospark.md#spark-specific-events)
  +
  +Twilio IPM bots can also exist in a multi-channel, multi-user environment. As a result, there are many additional events that will fire. In addition, Botkit will filter some messages, so that the bot will not receive it's own messages or messages outside of the channels in which it is present.
  [List of Twilio IPM-specific Events](readme-twilioipm.md#twilio-ipm-specific-events)
  Facebook messages are fairly straightforward. However, because Facebook supports inline buttons, there is an additional event fired when a user clicks a button.
  