CLI: Added closure wrapper

Author: dcodeIO

cli/pbjs.js

@@ -97,6 +97,7 @@ exports.main = function main(args, callback) {
                 "                   commonjs  CommonJS wrapper",
                 "                   amd       AMD wrapper",
                 "                   es6       ES6 wrapper (implies --es6)",
+                "                   closure   Just a closure adding to protobuf.roots (see -r)",
                 "",
                 "  -r, --root       Specifies an alternative protobuf.roots name.",
                 "",

cli/wrappers/closure.js

@@ -0,0 +1,7 @@
+(function($protobuf) {
+    "use strict";
+
+    $OUTPUT;
+
+    return $root;
+})(protobuf);