Use the HydratorPluginManager from zend-stdlib

For backwards compatibility. Essentially reverts #30, but requires
zend-stdlib 2.7.5 or higher to ensure backwards compat.

Author: weierophinney

composer.json

@@ -18,7 +18,7 @@
         "zendframework/zend-servicemanager": "~2.5",
         "zendframework/zend-hydrator": "~1.0",
         "zendframework/zend-form": "~2.6",
-        "zendframework/zend-stdlib": "~2.7"
+        "zendframework/zend-stdlib": "^2.7.5"
     },
     "require-dev": {
         "zendframework/zend-authentication": "~2.5",

src/Service/HydratorManagerFactory.php

@@ -11,5 +11,5 @@
 
 class HydratorManagerFactory extends AbstractPluginManagerFactory
 {
-    const PLUGIN_MANAGER_CLASS = 'Zend\Hydrator\HydratorPluginManager';
+    const PLUGIN_MANAGER_CLASS = 'Zend\Stdlib\Hydrator\HydratorPluginManager';
 }