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-classes/src/loose.js

@@ -0,0 +1,35 @@
+import nameFunction from "babel-helper-function-name";
+import VanillaTransformer from "./vanilla";
+import * as t from "babel-types";
+
+export default class LooseClassTransformer extends VanillaTransformer {
+  constructor() {
+    super(...arguments);
+    this.isLoose = true;
+  }
+
+  _processMethod(node, scope) {
+    if (!node.decorators) {
+      // use assignments instead of define properties for loose classes
+
+      let classRef = this.classRef;
+      if (!node.static) classRef = t.memberExpression(classRef, t.identifier("prototype"));
+      let methodName = t.memberExpression(classRef, node.key, node.computed || t.isLiteral(node.key));
+
+      let func = t.functionExpression(null, node.params, node.body);
+      let key = t.toComputedKey(node, node.key);
+      if (t.isStringLiteral(key)) {
+        func = nameFunction({
+          node: func,
+          id: key,
+          scope
+        });
+      }
+
+      let expr = t.expressionStatement(t.assignmentExpression("=", methodName, func));
+      t.inheritsComments(expr, node);
+      this.body.push(expr);
+      return true;
+    }
+  }
+}