Converted to node module

Converted to npm package
Added brower
Added browserify with minification
Updated Readme

lib/browser_fix/xhr.js

@@ -0,0 +1,35 @@
+
+/**
+ * Module dependencies.
+ */
+
+var global = (function() { return this; })(); // jshint ignore:line
+
+/**
+ * XMLHttpRequest constructor.
+ */
+
+var XMLHttpRequest = window.XMLHttpRequest; // jshint ignore:line
+
+/**
+ * Module exports.
+ */
+
+module.exports.XMLHttpRequest = XMLHttpRequest ? xhr : null;
+
+/**
+ * XMLHttpRequest constructor.
+ *
+ * @param {Object) opts (optional)
+ * @api public
+ */
+
+function xhr(obj) {
+  var instance;
+
+  instance = new XMLHttpRequest(obj);
+
+  return instance;
+}
+
+if (XMLHttpRequest) xhr.prototype = XMLHttpRequest.prototype;