add polyfill

lib/6to5/polyfill.js

@@ -0,0 +1,2 @@
+require("es6-symbol/implement");
+require("es6-shim");

lib/6to5/register.js

@@ -1,3 +1,5 @@
+require("./polyfill");
+
 var maps = {};
 var old  = require.extensions[".js"];
 

package.json

@@ -28,7 +28,8 @@
     "estraverse": "1.5.1",
     "fs-readdir-recursive": "0.0.2",
     "lodash": "2.4.1",
-    "mkdirp": "0.5.0"
+    "mkdirp": "0.5.0",
+    "es6-shim": "^0.18.0"
   },
   "devDependencies": {
     "mocha": "1.21.4",

polyfill.js

@@ -0,0 +1 @@
+require("./lib/6to5/polyfill");