Rails 3.1.3

Rails 3.1.3 has been released. This release mainly contains fixes for
regressions that popped up in 3.1.2.

## CHANGES ##

Action Pack:

* Downgrade sprockets to ~> 2.0.3. Using 2.1.0 caused regressions.

* Fix using `translate` helper with a html translation which uses the
    `:count` option for pluralization.

    *Jon Leighton*

Active Record:

* Perf fix: If we're deleting all records in an association, don't add
    a IN(..) clause to the query. *GH 3672*

    *Jon Leighton*

* Fix bug with referencing other mysql databases in set_table_name.
    *GH 3690*

* Fix performance bug with mysql databases on a server with lots of
    other databses. *GH 3678*

    *Christos Zisopoulos and Kenny J*

Railties:

* New apps should be generated with a sass-rails dependency of 3.1.5,
    not 3.1.5.rc.2

As ever, you can see a full list of changes on Github:

* https://github.com/rails/rails/compare/v3.1.2...v3.1.3