Rename App Methods

- renamed a lot of App methods to CamelCase
- replaced direct public variables with get-/set-Methods

mod/pubsubhubbub.php

@@ -105,7 +105,7 @@ function pubsubhubbub_init(App $a) {
 		// Social/StatusNet doesn't honour it (yet)
 
 		$body = Network::fetchUrl($hub_callback . "?" . $params);
-		$ret = $a->get_curl_code();
+		$ret = Network::getCurl()->getCode();
 
 		// give up if the HTTP return code wasn't a success (2xx)
 		if ($ret < 200 || $ret > 299) {