1. Updated global-tunnel to always use the object cached by the module loader, fixing a bug where the native and JS instances didn't match

2. Updated proxy-helper to always end a global-tunnel before fetching the auto-proxy script, fixing a bug where auto-proxy couldn't be fetched correctly after autoproxy was configured

modules/proxy-helper.js

@@ -582,6 +582,10 @@ function windows_getProxy()
 
 function auto_proxy_helper(target)
 {
+    // The first thing we need to do, is disable any existing proxy settings, otherwise we won't be able to find the autoconfig script
+    require('global-tunnel').end();
+
+
     var promise = require('promise');
 
     var ret = new promise(promise.defaultInit);