Adding possibility to use a different cache-backend for locking and caching

- Renaming *LockDriver to *Lock since it isn't a "driver" anymore

src/Core/Cache/RedisCache.php

@@ -192,4 +192,9 @@ class RedisCache extends AbstractCache implements IMemoryCache
 		$this->redis->unwatch();
 		return false;
 	}
+
+	public function __toString()
+	{
+		return self::TYPE_REDIS;
+	}
 }