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-es5-property-mutators/src/index.js

@@ -1,7 +1,35 @@
-export default function () {
+import * as defineMap from "babel-helper-define-map";
+
+export default function ({ types: t }) {
   return {
     visitor: {
-      // your visitor methods go here
+        ObjectExpression(path, file) {
+          let{ node } = path;
+          let hasAny = false;
+          for (let prop of (node.properties: Array)) {
+            if (prop.kind === "get" || prop.kind === "set") {
+              hasAny = true;
+              break;
+            }
+          }
+          if (!hasAny) return;
+
+          let mutatorMap = {};
+
+          node.properties = node.properties.filter(function (prop) {
+            if (!prop.computed && (prop.kind === "get" || prop.kind === "set")) {
+              defineMap.push(mutatorMap, prop, null, file);
+              return false;
+            } else {
+              return true;
+            }
+          });
+
+          path.replaceWith(t.callExpression(
+            t.memberExpression(t.identifier("Object"), t.identifier("defineProperties")),
+            [node, defineMap.toDefineObject(mutatorMap)]
+          ));
+        }
     }
   };
 }