bugfix: fix uninitialized constant Chef::ConfigFetcher

/usr/local/lib/ruby/gems/1.9/gems/chef-11.8.0/lib/chef/application.rb:77:in
`load_config_file': uninitialized constant Chef::ConfigFetcher
(NameError)
Merge pull request #135 from reallyenglish/tomoyukis

bugfix: fix uninitialized constant Chef::ConfigFetcher