include passenger_apache2::default rather than passenger_apache2::mod_rails

As it's now, `redmine::default` includes `passenger_apache2::mod_rails`, so the chef-client log goes:

    Recipe: passenger_apache2::source
      * package[httpd-devel] action install (up to date)
      * package[libcurl-devel] action install (up to date)
      * package[openssl-devel] action install (up to date)
      * package[zlib-devel] action install (up to date)
      * gem_package[passenger] action install (up to date)
      * execute[passenger_module] action run (up to date)
    Recipe: passenger_apache2::default
      * file[/etc/httpd/mods-available/passenger.load] action create (up to date)
      * execute[a2enmod passenger] action run (skipped due to not_if)
    Recipe: passenger_apache2::mod_rails
      * template[/etc/httpd/mods-available/passenger.conf] action create (up to date)

`template[/etc/httpd/mods-available/passenger.conf]` is created *AFTER* running `execute[a2enmod passenger]`, and `passenger.conf` would not be linked to `/etc/httpd/mods-enabled/passenger.conf`.

But if `redmine::default` includes `passenger_apache2::default`, the chef-client log will be:

    Recipe: passenger_apache2::source
      * package[httpd-devel] action install (up to date)
      * package[libcurl-devel] action install (up to date)
      * package[openssl-devel] action install (up to date)
      * package[zlib-devel] action install (up to date)
      * gem_package[passenger] action install (up to date)
      * execute[passenger_module] action run (up to date)
    Recipe: passenger_apache2::mod_rails
      * template[/etc/httpd/mods-available/passenger.conf] action create (up to date)
    Recipe: passenger_apache2::default
      * file[/etc/httpd/mods-available/passenger.load] action create (up to date)
      * execute[a2enmod passenger] action run (skipped due to not_if)

`template[/etc/httpd/mods-available/passenger.conf]` is created *BEFORE* running `execute[a2enmod passenger]`, and `passenger.conf` will not be linked to `/etc/httpd/mods-enabled/passenger.conf`.

Platform tested:
 * CentOS 6.3 64bit Plain

Version tested:
 * chef-solo 11.4.0
 * http://community.opscode.com/cookbooks/apache2 1.6.0
 * http://community.opscode.com/cookbooks/passenger_apache2 2.0.0
 * https://github.com/juanje/cookbook-redmine 0.0.4