stop people from patching babylon by building it

scripts/_util.js

@@ -0,0 +1,7 @@
+var fs = require("fs");
+
+exports.updateMain = function (main) {
+  var pkg = require("../package.json");
+  pkg.main = main;
+  fs.writeFileSync(__dirname + "/../package.json", JSON.stringify(pkg, null, "  "));
+};