Removes utm tracking codes from a URL query string.
$ npm install strip-utm --save
var stripUtm = require('./strip-utm');
var theUrl = 'http://example.com/?utm_campaign=RSS-Feedburner-All-Partial&utm_cid=RSS-Feedburner-All-Partial&utm_medium=feed&utm_source=feedly&utm_reader=feedly&z=last&m=middle&a=first&t=upper-middle';
console.log(stripUtm(theUrl));
http://example.com/?a=first&m=middle&t=upper-middle&z=last