visionmedia/superagent — pull request #453 by shesek (2014-09-17 02:34:41+00:00)
Title: added unset() to client-side

to match the [server-side method](https://github.com/visionmedia/superagent/blob/f41494f20f2b7838cd3dc92be276a286e10f56d1/lib/node/index.js#L293-L297).