Add CHANGELOG, prepare for 0.7.0

CHANGELOG.md

+## 0.7.0 (2015-07-21)
+
+* 第一个公开版本，发布 `layout`、`iconfont`、`button`、`form`、`checkbox`、`radio`、`switch`、`slider`、`input-number`、`datepicker`、`select`、`tabs`、`steps`、`breadcrumb`、`collapse`、`pagination`、`modal`、`message`、`dropdown`、`popover`、`popconfirm`、`tooltip`、`progress`、`table` 等组件。
+* 发布 [Ant Design 首页](http://ant.design/) 和入门文档。

README.md

@@ -32,6 +32,7 @@ React.render(<Datepicker />, mountNode);
 - [组件](http://ant.design/components/)
 - [构建调试工具](https://github.com/ant-design/antd-bin)
 - [开发计划](https://github.com/ant-design/ant-design/issues/9)
+- [修改记录](CHANGELOG.md)
 - [React 模块](http://react-component.github.io/)
 - [React 代码规范](https://github.com/react-component/react-component.github.io/blob/master/docs/zh-cn/component-code-style.md)
 - [组件设计原则](https://github.com/react-component/react-component.github.io/blob/master/docs/zh-cn/component-design.md)

package.json

 {
   "name": "antd",
-  "version": "0.7.0-beta4",
+  "version": "0.7.0",
   "title": "Ant Design",
   "description": "一个设计&前端框架",
   "homepage": "http://ant.design/",