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-react-jsx-compat/src/index.js

@@ -1,6 +1,10 @@
 export default function ({ types: t }) {
   return {
-    visitor: require("babel-plugin-builder-react-jsx")({
+    manipulateOptions(opts, parserOpts) {
+      parserOpts.plugins.push("jsx");
+    },
+
+    visitor: require("babel-helper-builder-react-jsx")({
       pre(state) {
         state.callee = state.tagExpr;
       },