Added /src/PhpImap/__autoload.php (alternative to Composer autoloader)

Closes $81

Author: barbushin

src/PhpImap/__autoload.php

@@ -0,0 +1,8 @@
+<?php namespace PhpImap;
+
+spl_autoload_register(function ($class) {
+	if(strpos($class, __NAMESPACE__) === 0) {
+		/** @noinspection PhpIncludeInspection */
+		require_once(__DIR__ . DIRECTORY_SEPARATOR . '..' . DIRECTORY_SEPARATOR . str_replace('\\', DIRECTORY_SEPARATOR, $class) . '.php');
+	}
+});