Support option to Write with response or Write without response

[hbull1]

My particular application communicates with a peripheral set to require Write with response. I was only able to correctly write to a characteristic by changing the following line to false to allow Write with response. Would be useful to send option from node (ex. msg.WriteWithResponse=true, ....=false, etc).

 // true if for write without response
            characteristic.write(data, false, function(error) {