add npm run pub task to help moving towards public 'scoped package'…

… releases as per https://docs.npmjs.com/misc/scope; this is also related to GerHobbelt/jison#11

package.json

@@ -9,7 +9,8 @@
   "description": "A parser for lexical grammars used by jison",
   "main": "lex-parser.js",
   "scripts": {
-    "test": "make test"
+    "test": "make test",
+    "pub": "npm publish --access public"
   },
   "repository": {
     "type": "git",