fixed the case where a 4xx error would not populate the exception properly and we'd end up with a wrong message
fixed the case where a 4xx error would not populate the exception properly and we'd end up with a wrong message

Credit goes to CostaC for his solution described here:
https://github.com/twilio/twilio-php/issues/133#issuecomment-21303014

beachboysapp/urgentMe,twilio/twilio-php,javierwilson/twilio-php,achoe/twilio-php,pablophg/twilio-php,sayan801/twilio-php,beachboysapp/urgentMe,Git-Host/twilio-php,FTrubitz/twilio-php