[COOK-2806] Include passenger_apache2::default instead of mod_rails

[COOK-2806](http://tickets.opscode.com/browse/COOK-2806)

[COOK-2750](http://tickets.opscode.com/browse/COOK-2750) identifies the issue with `passenger_apache2::mod_rails` and recommends the removal of that recipe entirely.

As it states, `passenger_apache2::default` already includes `mod_rails` and would work fine.

(recreation of #27, but this time with the right author information)