solve tj#306, and bin in $PATH make sense now

Almost revert tj#173 which lead to the bug in tj#306

index.js

@@ -8,6 +8,7 @@ var spawn = require('child_process').spawn;
 var path = require('path');
 var dirname = path.dirname;
 var basename = path.basename;
+var fs = require('fs');
 
 /**
  * Expose the root command.
@@ -449,13 +450,14 @@ Command.prototype.executeSubCommand = function(argv, args, unknown) {
   var dir = dirname(argv[1]);
   var bin = basename(argv[1], '.js') + '-' + args[0];
 
-  // check for ./<bin> first
+  // prefer local `./<bin>` to bin in the $PATH
   var local = path.join(dir, bin);
+  if (fs.existsSync(local)) bin = local;
 
   // run it
   args = args.slice(1);
-  args.unshift(local);
-  var proc = spawn('node', args, { stdio: 'inherit', customFds: [0, 1, 2] });
+
+  var proc = spawn(bin, args, { stdio: 'inherit'} );
   proc.on('error', function(err) {
     if (err.code == "ENOENT") {
       console.error('\n  %s(1) does not exist, try --help\n', bin);