ValueLoader::get( $key = null,  $default = null )

	public function get($key = null, $default = null)
	{
		$target = $this->value;

		if (is_null($key)) {
			return $target;
		}

        if (isset($target[$key])) {
        	return $target[$key];
        }

        foreach (explode('.', $key) as $segment) {
            if (! is_array($target) || ! array_key_exists($segment, $target)) {
                return $default;
            }

            $target = $target[$segment];
        }

        return $target;
	}