6.0.0

I'm extremely stupid and didn't commit as I go. To anyone reading this
I'm extremely sorry. A lot of these changes are very broad and I plan on
releasing Babel 6.0.0 today live on stage at Ember Camp London so I'm
afraid I couldn't wait. If you're ever in London I'll buy you a beer
(or assorted beverage!) to make up for it, also I'll kiss your feet and
give you a back massage, maybe.

packages/babel-plugin-transform-jscript/src/index.js

@@ -2,17 +2,18 @@ export default function ({ types: t }) {
   return {
     visitor: {
       FunctionExpression: {
-        exit(node) {
+        exit(path) {
+          let { node } = path;
           if (!node.id) return;
           node._ignoreUserWhitespace = true;
 
-          return t.callExpression(
+          path.replaceWith(t.callExpression(
             t.functionExpression(null, [], t.blockStatement([
               t.toStatement(node),
               t.returnStatement(node.id)
             ])),
             []
-          );
+          ));
         }
       }
     }