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-syntax-class-constructor-call/src/index.js

@@ -0,0 +1,7 @@
+export default function () {
+  return {
+    manipulateOptions(opts, parserOpts) {
+      parserOpts.plugins.push("classConstructorCall");
+    }
+  };
+}