Merge branch 'feat-system-module-rewrite' of https://github.com/douglasduteil/6to5 into 2.0.0

Conflicts:
	lib/6to5/transformation/modules/system.js
	test/fixtures/transformation/es6-modules-system/exports-from/expected.js

test/fixtures/transformation/.es6-modules-system/exports-from/expected.js

@@ -1,33 +0,0 @@
-System.register("actual", ["foo"], function (_export) {
-  "use strict";
-
-  var __moduleName = "actual";
-
-  var _localExports = ['foo', 'bar', 'default'];
-
-  return {
-    setters: [
-      function(m) {
-        _export("foo", m.foo);
-
-        _export("foo", m.foo);
-
-        _export("bar", m.bar);
-
-        _export("bar", m.foo);
-
-        _export("default", m.foo);
-
-        _export("default", m.foo);
-
-        _export("bar", m.bar);
-
-        for (var p in m) {
-          if (_localExports.indexOf(i) == -1)
-            _export(p, m[p]);
-        }
-      }
-    ],
-    execute: function () {}
-  };
-});

test/fixtures/transformation/es6-modules-system/exports-default/expected.js

@@ -5,10 +5,8 @@ System.register("actual", [], function (_export) {
 
   function _anonymous() {}
   var _anonymous2;
-
   function foo() {}
   var Foo;
-
   return {
     setters: [],
     execute: function () {

test/fixtures/transformation/es6-modules-system/exports-from/expected.js

@@ -1,11 +1,16 @@
-System.register("actual", [], function (_export) {
+System.register("actual", ["foo"], function (_export) {
   "use strict";
 
   var __moduleName = "actual";
 
   return {
-    setters: [
-    function(m) {
+    setters: [function (m) {
+      (function (obj) {
+        for (var i in obj) {
+          _export(i, obj[i]);
+        }
+      })(m);
+
       _export("foo", m.foo);
 
       _export("foo", m.foo);
@@ -20,7 +25,6 @@ System.register("actual", [], function (_export) {
 
       _export("bar", m.bar);
     }],
-    execute: function () {
-    }
+    execute: function () {}
   };
 });

test/fixtures/transformation/es6-modules-system/exports-named/expected.js

@@ -0,0 +1,24 @@
+System.register("actual", [], function (_export) {
+  "use strict";
+
+  var __moduleName = "actual";
+
+  return {
+    setters: [],
+    execute: function () {
+      _export("foo", foo);
+
+      _export("foo", foo);
+
+      _export("bar", bar);
+
+      _export("bar", foo);
+
+      _export("default", foo);
+
+      _export("default", foo);
+
+      _export("bar", bar);
+    }
+  };
+});

test/fixtures/transformation/es6-modules-system/exports-variable/expected.js

@@ -13,7 +13,6 @@ System.register("actual", [], function (_export) {
   _export("foo7", foo7);
 
   var foo8;
-
   return {
     setters: [],
     execute: function () {