added package class.

system/package.php

@@ -0,0 +1,39 @@
+<?php namespace System;
+
+class Package {
+
+	/**
+	 * All of the loaded packages.
+	 *
+	 * @var array
+	 */
+	public static $loaded = array();
+
+	/**
+	 * Load a package or set of packages.
+	 *
+	 * @param  string|array  $package
+	 * @return void
+	 */
+	public static function load($package)
+	{
+		if (is_array($package))
+		{
+			foreach ($package as $value)
+			{
+				static::load($value);			
+			}
+		}
+
+		// Packages may have a bootstrap file, which commonly is used to register auto-loaders
+		// and perform other initialization needed to use the package. If the package has a
+		// bootstrapper, we will require it here.
+		if ( ! array_key_exists($package, static::$loaded) and file_exists($path = PACKAGE_PATH.$package.'/bootstrap'.EXT))
+		{
+			require $path;
+		}
+
+		static::$loaded[] = $package;
+	}
+
+}