Changed all occurring del to delete

Fixes #26 
Thanks!

Reference https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/delete

Sent from my iPhone

> On 13 Oct 2014, at 17:43, Rajiv Tirumalareddy <notifications@github.com> wrote:
> 
> In libs/util/http.client.js:
> 
> > @@ -254,7 +254,7 @@ module.exports = {
> >       * @param {Number} [config.retry.max_retries=2]   Nmber of max retries.
> >       * @param {Function} callback The callback funciton, with two params (error, response)
> >       */
> > -    del : function (url, headers, config, callback) {
> > +    delete : function (url, headers, config, callback) {
> delete is a keyword so could you put quotes around it? Usually throws when this code is executed in IE.
> 
> —
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