Make the repl respect node_modules folders.

This is important so that in the future, this will work:

    $ cd ~/dev/js/some-project
    $ npm install redis
    $ node
    > require.resolve('redis')
    '/Users/isaacs/dev/js/some-project/node_modules/redis/index.js'

lib/repl.js

@@ -36,6 +36,9 @@ if (process.platform != 'win32') {
 // hack for require.resolve("./relative") to work properly.
 module.filename = process.cwd() + '/repl';
 
+// hack for repl require to work properly with node_modules folders
+module.paths = require('module')._nodeModulePaths(module.filename);
+
 
 function resetContext() {
   context = vm.createContext();