Add XMLHttpRequest.withCredentials option for the browser.

Author: Denis Rechkunov

README.md

@@ -113,6 +113,8 @@ UHRBase.prototype.request = function (parameters) { }
 {
 	method: 'GET',
 	timeout: 30000,
+	// sets value to XMLHttpRequest.withCredentials, works only in the browser
+	withCredentials: false, 
 	unsafeHTTPS: false, // require valid certificate by default
 	headers: {
 		Cookie: 'name=value'

browser/UHR.js

@@ -131,6 +131,10 @@ UHR.prototype._doRequest = function (parameters) {
 		);
 		xhr.timeout = parameters.timeout;
 
+		if (parameters.withCredentials) {
+			xhr.withCredentials = true;
+		}
+
 		Object.keys(parameters.headers)
 			.forEach(function (headerName) {
 				xhr.setRequestHeader(