Add code to allow configuration for the plugin factory to be stored on a per install basis.

Tests/PHPCI/Plugin/Util/ExamplePluginConfig.php

@@ -0,0 +1,22 @@
+<?php
+return function (PHPCI\Plugin\Util\Factory $factory) {
+    $factory->registerResource(
+        // This function will be called when the resource is needed.
+        function() {
+            return array(
+                'Foo' => "Stuff",
+                'Bar' => "More Stuff"
+            );
+        },
+
+        // In addition to the function for building the resource the system
+        // also needs to be told when to load the resource. Either or both
+        // of the following arguments can be used (null to ignore)
+
+        // This resource will only be given when the argument name is:
+        "ResourceArray",
+
+        // The resource will only be given when the type hint is:
+        PHPCI\Plugin\Util\Factory::TYPE_ARRAY
+    );
+};