Add test for JSX support.

test/files/es6/jsx/basic.jsx

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+import React from 'react';
+import other from './other';
+
+export default React.createClass({
+  render: function() {
+    return <div>
+      foo
+      {this.props.children}
+    </div>
+  }
+});

test/files/es6/jsx/other.jsx

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+export default 'other';

test/jsx.js

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+var should = require('should'),
+  madge = require('../lib/madge');
+
+describe('JSX Basics', function() {
+    it('can detect imports', function() {
+        madge([__dirname + '/files/es6/jsx/basic.jsx'], {
+          format: 'es6'
+        }).obj().should.eql({basic: [
+            '../../../../other',
+            '../../../../react'
+            ]});
+    });
+});