Log Message:
Update ruby-activesupport32 to 3.2.15.

## Rails 3.2.15 (Oct 16, 2013) ##

* Fix ActiveSupport::Cache::FileStore#cleanup to no longer rely on missing
  each_key method.

    *Murray Steele*

* Add respond_to_missing? for TaggedLogging which is best practice when
  overriding method_missing. This permits wrapping TaggedLogging by another
  log abstraction such as em-logger.

    *Wolfram Arnold*