[Botkit] trigger controller events

Sending text messages is only one part of dialogue. Equally important is events emitted by client side of connection.

For example I want to trigger hello event of Sockets connector to make bot send the greeting before user starts typing. And I want to send a custom message type from frontend to make my bot perform certain action.

#me
{
    "type": "payment",
    "card_number": "4444********1111",
    "cv2": "***",
    "expiry": "12/19"
}