whitelist: Do case-insensitive whitelist matching

Matching whitelisted bridges using a case-insensitive match makes
sense for following reasons:

- Wrong upper/lower case spelling in the whitelist is not easily
discovered. Example: Misspelling 'Youtube' as 'YouTube' will not
show the 'Youtube' bridge (while it is expected to show)

- Two bridges with the same name but different letter casing are
discouraged to prevent confusion and keep the project compatible
with Windows machines

lib/Bridge.php

@@ -94,8 +94,8 @@ EOD;
 	static public function isWhitelisted($whitelist, $name){
 		if(in_array($name, $whitelist)
 		|| in_array($name . '.php', $whitelist)
-		|| in_array($name . 'Bridge', $whitelist) // DEPRECATED
-		|| in_array($name . 'Bridge.php', $whitelist) // DEPRECATED
+		|| in_array($name . 'bridge', $whitelist) // DEPRECATED
+		|| in_array($name . 'bridge.php', $whitelist) // DEPRECATED
 		|| (count($whitelist) === 1 && trim($whitelist[0]) === '*')) {
 			return true;
 		} else {