Minor fix for Ruby 1.9 compatibility

Author: arthurgeek

config.ru

@@ -1,13 +1,13 @@
 #!/usr/bin/env ruby
 require 'logger'
 
-$LOAD_PATH.unshift File.expand_path(File.dirname(__FILE__) + '/lib')
+$LOAD_PATH.unshift ::File.expand_path(::File.dirname(__FILE__) + '/lib')
 require 'resque/server'
 
 # Set the RESQUECONFIG env variable if you've a `resque.rb` or similar
 # config file you want loaded on boot.
-if ENV['RESQUECONFIG'] && File.exists?(File.expand_path(ENV['RESQUECONFIG']))
-  load File.expand_path(ENV['RESQUECONFIG'])
+if ENV['RESQUECONFIG'] && ::File.exists?(::File.expand_path(ENV['RESQUECONFIG']))
+  load ::File.expand_path(ENV['RESQUECONFIG'])
 end
 
 use Rack::ShowExceptions