prate to set AIRBRAKE_SERVER from env if available. This allows use of errbit.
prate to set AIRBRAKE_SERVER from env if available.
This allows use of errbit.

droppedoncaprica/node-airbrake,felixge/node-airbrake,airbrake/node-airbrake,sinsoku/node-airbrake,miguelmota/node-airbrake,protonet/node-airbrake