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-async-to-module-method/src/index.js

@@ -0,0 +1,18 @@
+import remapAsyncToGenerator from "babel-helper-remap-async-to-generator";
+
+export default function () {
+  return {
+    inherits: require("babel-plugin-syntax-async-functions"),
+
+    visitor: {
+      Function(path, state) {
+        if (!path.node.async || path.node.generator) return;
+
+        remapAsyncToGenerator(
+          path,
+          state.addImport(state.opts.module, state.opts.method)
+        );
+      }
+    }
+  };
+}