updated node modules

nodejs/node_modules/stylus/bin/stylus

@@ -203,7 +203,7 @@ while (args.length) {
     case '-h':
     case '--help':
       console.error(usage);
-      process.exit(0);
+      return;
     case '-d':
     case '--compare':
       compare = true;
@@ -256,8 +256,7 @@ while (args.length) {
     case '-V':
     case '--version':
       console.log(stylus.version);
-      process.exit(0);
-      break;
+      return;
     case '-o':
     case '--out':
       dest = args.shift();
@@ -409,7 +408,7 @@ function help(name) {
 
 // Compilation options
 
-if (files.length > 1 && extname(dest) === '.css') {
+if (files.length > 1 && isCSS(dest)) {
   dest = dirname(dest);
 }
 
@@ -690,7 +689,7 @@ function compileFile(file) {
 
 function createPath(file, sourceMap) {
   var out;
-  if (files.length === 1 && extname(dest) === '.css') {
+  if (files.length === 1 && isCSS(dest)) {
     return [dest, sourceMap ? '.map' : ''].join('');
   }
   // --out support
@@ -700,6 +699,14 @@ function createPath(file, sourceMap) {
     : join(dirname(file), out);
 }
 
+/**
+ * Check if the given path is a CSS file.
+ */
+
+function isCSS(file) {
+  return file && '.css' === extname(file);
+}
+
 function writeFile(file, css) {
   // --print support
   if (print) return process.stdout.write(css);