#1250384 patch by mikeytown2: Strict warning: Only variables should be passed by reference in rules_core_action_execute() .

 #814416 patch by drnugent, tim.plunkett and me: fix warnings when using the features integration by removing an unnecessary argument from rules_categories_features_export_render()

 #788108 patch by klausi: require PHP > 5.1. Due to a lack of PHP 4 testers, PHP 4 support is dropped.

 #774250 patch by keinstein: fixed Declaration of rules_data_type_string::get_default_input_form() should be compatible.. warnings that might occur depending on the PHP settings

 #703294 patch by Berdir and me: fixed a PHP 5.3 warning in the rules admin UI and fixed passing rules by reference for the import hook.

    * Dropped support for single rule and rule set components. Still they can
      be exported by category.
    * Fixed exporting by category to work fine with the latest feature dev snapshot.

For instructions how to fix existing features making use of rule components see http://drupal.org/node/597330#comment-2691206.