Add noInterop option to babel-plugin-transform-es2015-modules-commonjs.

The intent of this option is to toggle module interop behavior. When `true`
no `interopRequireXXX` helper invocations will be emitted.

packages/babel-plugin-transform-es2015-modules-commonjs/test/fixtures/noInterop/export-from/actual.js

@@ -0,0 +1 @@
+export { default } from 'foo';

packages/babel-plugin-transform-es2015-modules-commonjs/test/fixtures/noInterop/export-from/expected.js

@@ -0,0 +1,14 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+
+var _foo = require('foo');
+
+Object.defineProperty(exports, 'default', {
+  enumerable: true,
+  get: function () {
+    return _foo.default;
+  }
+});

packages/babel-plugin-transform-es2015-modules-commonjs/test/fixtures/noInterop/import-default-only/actual.js

@@ -0,0 +1,3 @@
+import foo from "foo";
+
+foo();

packages/babel-plugin-transform-es2015-modules-commonjs/test/fixtures/noInterop/import-default-only/expected.js

@@ -0,0 +1,5 @@
+"use strict";
+
+var _foo = require("foo");
+
+(0, _foo.default)();

packages/babel-plugin-transform-es2015-modules-commonjs/test/fixtures/noInterop/import-wildcard/actual.js

@@ -0,0 +1,4 @@
+import * as foo from 'foo';
+
+foo.bar();
+foo.baz();

packages/babel-plugin-transform-es2015-modules-commonjs/test/fixtures/noInterop/import-wildcard/expected.js

@@ -0,0 +1,6 @@
+'use strict';
+
+var _foo = require('foo');
+
+_foo.bar();
+_foo.baz();

packages/babel-plugin-transform-es2015-modules-commonjs/test/fixtures/noInterop/options.json

@@ -0,0 +1,3 @@
+{
+  "plugins": ["external-helpers", ["transform-es2015-modules-commonjs", { "noInterop": true }]]
+}

packages/babel-plugin-transform-es2015-modules-commonjs/test/fixtures/strict/import-wildcard/actual.js

@@ -0,0 +1,4 @@
+import * as foo from 'foo';
+
+foo.bar();
+foo.baz();

packages/babel-plugin-transform-es2015-modules-commonjs/test/fixtures/strict/import-wildcard/expected.js

@@ -0,0 +1,6 @@
+'use strict';
+
+var _foo = require('foo');
+
+_foo.bar();
+_foo.baz();