important fix inside HttpFunctions.php. I noticed that when you call HttpRequest...

important fix inside HttpFunctions.php. I noticed that when you call HttpRequest::factory with noProxy=true for example inside an intranet, this is ignored in (Curl)HttpRequest because the proxy url is not cleared. This commit makes sure at lowest level - namel in the public function proxySetup() - that a optional(true) value of  noProxy is observed and that it (now) also clears the proxy url. (I have been told that I am allowed to commit this patch. Please carefully review, as usual).