add cron support for fedora 19

chef-client::cron does not support fedora 19 in the recipe. this might be due to fedora 19 not being classified as "rhel". In chef-client::cron, copying "rhel" and renaming it to "fedora" allows the cron recipe to work with Fedora 19.

    Failed run output:
    Cookbook 'chef-client' does not contain a file at any of these locations:
      templates/fedora-19//init.d/chef-client.erb
      templates/fedora//init.d/chef-client.erb
      templates/default//init.d/chef-client.erb
    
    This cookbook _does_ contain: ['conf.d/chef-client.conf.erb','rc.d/chef-client.erb','chef-client.pill.erb','client.rb.erb','com.opscode.chef-client.plist.erb','debian/default/chef-client.erb','debian/init.d/chef-client.erb','debian/init/chef-client.conf.erb','redhat/init.d/chef-client.erb','redhat/sysconfig/chef-client.erb','solaris/chef-client.erb','solaris/manifest.xml.erb','suse/init.d/chef-client.erb','suse/sysconfig/chef-client.erb','sv-chef-client-log-run.erb','sv-chef-client-run.erb','chef-client.xml.erb']
    
     
    Resource Declaration:
    ---------------------
    # In /var/chef/cache/cookbooks/chef-client/recipes/cron.rb

     42:   template "/etc/init.d/chef-client" do
     43:     source "#{dist_dir}/init.d/chef-client.erb"
     44:     mode 0755
     45:     variables( :client_bin => client_bin )
     46:   end
     47: 
    
    
    
    Compiled Resource:
    ------------------
    # Declared in /var/chef/cache/cookbooks/chef-client/recipes/cron.rb:42:in `from_file'    
    
    template("/etc/init.d/chef-client") do
      provider Chef::Provider::Template
      action "create"
      retries 0
      retry_delay 2
      path "/etc/init.d/chef-client"
      backup 5
      atomic_update true
      source "/init.d/chef-client.erb"
      variables {:client_bin=>"/usr/bin/chef-client"}
      cookbook_name "chef-client"
      recipe_name "cron"
      mode 493
    end