track current retries and abort on request error if it originates from old instance
track current retries and abort on request error if it originates from old instance

fredigato/superagent,visionmedia/superagent,focusaurus/superagent,craigspaeth/superagent,craigspaeth/superagent,visionmedia/superagent,focusaurus/superagent,visionmedia/superagent,fredigato/superagent