Fixed the permissions resolver not being loaded if it was loaded after a plugin was enabled or re-enabled.

src/com/sk89q/bukkit/migration/PermissionsResolverServerListener.java

@@ -46,6 +46,7 @@ public void onPluginEnabled(PluginEvent event) {
             manager.setPluginPermissionsResolver(plugin);
         } else if (name.equalsIgnoreCase("GroupUsers") || name.equalsIgnoreCase("Permissions")) {
             manager.findResolver();
+            manager.load();
         }
     }
 
@@ -63,6 +64,7 @@ public void onPluginDisabled(PluginEvent event) {
                 || name.equalsIgnoreCase("GroupUsers")
                 || name.equalsIgnoreCase("Permissions")) {
             manager.findResolver();
+            manager.load();
         }
     }