mixing in sys again, for the tests

lib/coffee_script/runner.js

@@ -1,6 +1,7 @@
 (function(){
   var coffee, paths;
   // Quickie script to compile and run all the files given as arguments.
+  process.mixin(require('sys'));
   coffee = require('./coffee-script');
   paths = process.ARGV;
   paths = paths.slice(2, paths.length);