Clone Browser

[Migrate]

Hi,

I've create a clone browser function so I can create new browser with the same cookieJar.

browser.js:

/**
 * Clone a new `Browser` with the same cookieJar, external options and userAgent as the sourceBrowser.
 *
 * @param {Object} source browser.
 * @api public
 */
Browser.prototype.cloneBrowser = function(sourceBrowser) {
    this.external = sourceBrowser.external;
    this.cookieJar = sourceBrowser.cookieJar;
    this.userAgent = sourceBrowser.userAgent;
};

tobi.js:

/**
 * Initialize a new `Browser` with the same cookieJar and userAgent 
 */
exports.cloneBrowser = function(a,b,c,d){
  new_browser = new exports.Browser(a,b,c);
  new_browser.cloneBrowser(d)
  return new_browser;
};

I need this function because I have several hosts that share the same cookies.

default_browser = tobi.createBrowser(80, default_host, { external: true });
new_brower = tobi.cloneBrowser(80, new_host, {}, browser);

Can you please add this function (or something similar) to the next release?
Thanks.
Best regards,
Migrate