Return of require('querystring') does not match Node API

[bclinkinbeard]

According to http://nodejs.org/api/querystring.html, the returned object should have escape and unescape methods. Instead, it has encode and decode, with a different API, in that they return objects instead of strings.

[ghost]

This should be handled over in the querystring-es3 (github) package. Need to keep things tidy in browserify core issues.