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-modules-systemjs/README.md

@@ -0,0 +1,33 @@
+# babel-plugin-transform-es2015-modules-systemjs
+
+## Installation
+
+```sh
+$ npm install babel-plugin-transform-es2015-modules-systemjs
+```
+
+## Usage
+
+### Via `.babelrc` (Recommended)
+
+**.babelrc**
+
+```json
+{
+  "plugins": ["transform-es2015-modules-systemjs"]
+}
+```
+
+### Via CLI
+
+```sh
+$ babel --plugins transform-es2015-modules-systemjs script.js
+```
+
+### Via Node API
+
+```javascript
+require("babel-core").transform("code", {
+  plugins: ["transform-es2015-modules-systemjs"]
+});
+```