Update prepare() method on Action subclasses.

Fixes handle()-related strict warnings such as "Strict Standards:
Declaration of AdminPanelAction::prepare() should be compatible with
Action::prepare(array $args = Array)

Ref. #190

plugins/RSSCloud/actions/loggingaggregator.php

@@ -57,7 +57,7 @@ class LoggingAggregatorAction extends Action
      *
      * @return boolean false if user doesn't exist
      */
-    function prepare($args)
+    function prepare(array $args = array())
     {
         parent::prepare($args);
 

plugins/RSSCloud/actions/rsscloudrequestnotify.php

@@ -50,7 +50,7 @@ class RSSCloudRequestNotifyAction extends Action
      *
      * @return boolean false if user doesn't exist
      */
-    function prepare($args)
+    function prepare(array $args = array())
     {
         parent::prepare($args);