stop passing the `request` body in the callback in case of error
stop passing the `request` body in the callback in case of error

Passing back the request body in case of errors causes massive problems if there is a logger such as bunyan listening for errors. In fact it tries to log all the body object which contains a binary buffer. resulting into 259M of crap
bright-sparks/twilio-node,philnash/twilio-node,qwaszxlll/twilio-node,auth0/twilio-node,jugalkishor-sujal/twilio-node,twilio/twilio-node,carlosdp/twilio-node,wanjunsli/twilio-node,lern/twilio-node,khalerc/twilio-node,kyroskoh/twilio-node,metherton/twilio-node