Revert "Composer autoload include statements to make Composer depende…

…ncies work (ref #833)"

This reverts commit 7f0bfce.

The autoloader is already included.

autoload.php

@@ -180,10 +180,3 @@ public static function getLoadedFiles()
 // it gets a chance to hear about every autoload request, and record
 // the file and class name for it.
 spl_autoload_register(__NAMESPACE__.'\Autoload::load', true, true);
-
-// Include the composer autoloader for composer installs.
-if (file_exists($a = __DIR__.'/../../autoload.php') === true) {
-    include_once $a;
-} else if (file_exists($a = __DIR__.'/vendor/autoload.php') === true) {
-    include_once $a;
-}