Log Message:
Update ruby-activerecord32 to 3.2.15.

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

* When calling the method .find_or_initialize_by_* from a collection_proxy it
  should set the inverse_of relation even when the entry was found on the db.

    *arthurnn*

* Callbacks on has_many should access the in memory parent if a inverse_of is
  set.

    *arthurnn*

* Fix `FinderMethods#last` unscoped primary key.

    Fixes #11917.

    *Eugene Kalenkovich*

* Load fixtures from linked folders.

    *Kassio Borges*

* When using optimistic locking, `update` was not passing the column to
 `quote_value` to allow the connection adapter to properly determine how to
  quote the value. This was affecting certain databases that use specific
  colmn types.

    Fixes: #6763

    *Alfred Wong*