Ubuntu 10 support fix

Currently, this cookbook gives me the following error in **Ubuntu 10.04**:

```
         * package[php5-fpm] action upgrade[2013-09-05T16:30:25+00:00] INFO: Processing package[php5-fpm] action upgrade (php-fpm::default line 96)
       
           * No candidate version available for php5-fpm
       ================================================================================
       Error executing action `upgrade` on resource 'package[php5-fpm]'
       ================================================================================
       
       
       Chef::Exceptions::Package
       -------------------------
       No candidate version available for php5-fpm
       
       
       Resource Declaration:
       ---------------------
       # In /tmp/kitchen-chef-solo/cookbooks/php-fpm/recipes/default.rb
       
        96: package php_fpm_service_name do
        97:   action :upgrade
        98: end
        99: 
       
       
       
       Compiled Resource:
       ------------------
       # Declared in /tmp/kitchen-chef-solo/cookbooks/php-fpm/recipes/default.rb:96:in `from_file'
       
       package("php5-fpm") do
         action [:upgrade]
         retries 0
         retry_delay 2
         package_name "php5-fpm"
         cookbook_name :"php-fpm"
         recipe_name "default"
       end
```

Fixed changing the used apt repository and the config file path.