Update integration tests (#80)

* Use the lastest vesion of the integration tests

* Make sure update script does not update packages that does not require integration tests

* Do not use deperecated functions

Author: Nyholm

composer.json

@@ -32,7 +32,7 @@
     },
     "require-dev":       {
         "phpunit/phpunit":         "^4.0 || ^5.1",
-        "cache/integration-tests": "^0.10"
+        "cache/integration-tests": "^0.11"
     },
     "suggest":          {
         "ext-memcached": "The extension required to use this pool."