Removal of polyfill support

- With the upcoming 2.1.4 release, polyfill support is handled transparently
  within the framework, and no longer requires separate autoloading. In fact,
  the files used for autoloading previously now raise a deprecation notice.

composer.json

@@ -9,6 +9,6 @@
     "homepage": "http://framework.zend.com/",
     "require": {
         "php": ">=5.3.3",
-        "zendframework/zendframework": "2.*"
+        "zendframework/zendframework": ">2.1.3"
     }
 }

init_autoloader.php

@@ -41,8 +41,6 @@
                 'autoregister_zf' => true
             )
         ));
-        require $zf2Path . '/Zend/Stdlib/compatibility/autoload.php';
-        require $zf2Path . '/Zend/Session/compatibility/autoload.php';
     }
 }