Closes GH-232 Make the repl's global the right thing

lib/repl.js

@@ -45,6 +45,8 @@ function resetContext() {
   for (var i in global) context[i] = global[i];
   context.module = module;
   context.require = require;
+  context.global = context;
+  context.global.global = context;
   for (var i in require.cache) delete require.cache[i];
 }