Upgrade to Rails 4.0.13 to fix datetime helpers
Upgrade to Rails 4.0.13 to fix datetime helpers

In Rails 4.0.0, date_select and related helpers would fail in some
circumstances with `undefined method 'to_datetime' for 0:Fixnum` errors.
This was causing our tests to fail. Upgrading to the latest Rails 4.0.x
version fixes the bug and now all tests pass.

See: https://github.com/rails/rails/issues/25571

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