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-es2015-classes/src/index.js

@@ -1,7 +1,32 @@
-export default function () {
+import LooseTransformer from "./loose";
+import VanillaTransformer from "./vanilla";
+import nameFunction from "babel-helper-function-name";
+
+export default function ({ types: t }) {
   return {
     visitor: {
-      // your visitor methods go here
+      ClassDeclaration(path) {
+        let { node } = path;
+
+        if (path.parentPath.isExportDefaultDeclaration()) {
+          path = path.parentPath;
+          path.insertAfter(t.exportDefaultDeclaration(node.id));
+        }
+
+        path.replaceWith(t.variableDeclaration("let", [
+          t.variableDeclarator(node.id, t.toExpression(node))
+        ]));
+      },
+
+      ClassExpression(path, state) {
+        let inferred = nameFunction(path);
+        if (inferred) return inferred;
+
+        let Constructor = VanillaTransformer;
+        if (state.opts.loose) Constructor = LooseTransformer;
+
+        path.replaceWith(new Constructor(path, state.file).run());
+      }
     }
   };
 }