Configurable Request For Approval Messages

[markwallsgrove]

To gain attention to the request for approval it would be awesome if the message was configurable. Personally I would like to set the message to @here I need approval for that....

Would it be an improvement to provide the facility to configure all messages being sent?

 context.response.reply "I need approval for that from someone in '#{context.listener.options.approval.group}'. In order to approve, say '#{@robot.name} approve #{magic_word}'."

[markwallsgrove]

/cc @kiyanwang