Added function for setting configuration file path.

A few functions to make it look better with using laravel-payex.
Laravel love <3

payex.php

@@ -22,21 +22,26 @@ class PayEx
 
 	static private $config;
 	static private $isConstructed;
+	static private $configFile = "config.php";
 
 	function __construct(){ PayEx::construct(); }
 
 	static function construct(){
 		if(!self::$isConstructed){
 			self::$config = new stdClass();
 
-			$config = include("config.php");
+			$config = include(self::$configFile);
 			foreach($config as $name => $value){
 				self::setConfig($name, $value);
 			}
 			self::$isConstructed = true;
 		}
 	}
 
+	static function setConfigFile($filepath){
+		self::$configFile = $filepath;
+	}
+
 	static function setConfig($name, $value){
 		self::$config->{$name} = $value;
 	}