add dead simple babylon bin

packages/babylon/bin/babylon.js

@@ -0,0 +1,15 @@
+#!/usr/bin/env node
+
+var babylon = require("../lib/index");
+var fs      = require("fs");
+
+var filename = process.argv[2];
+if (!filename) {
+  console.error("no filename specified");
+  process.exit(0);
+}
+
+var file = fs.readFileSync(filename, "utf8");
+var ast  = babylon.parse(file);
+
+console.log(JSON.stringify(ast, null, "  "));

packages/babylon/package.json

@@ -7,4 +7,6 @@
   "license": "MIT",
   "repository": "babel/babel",
   "main": "lib/index.js"
-}
+}  "bin": {
+    "babylon": "./bin/babylon.js"
+  }