#67 edit donation msg

이제 기증 메세지를 수정할 수 있습니다.

![a](https://cloud.githubusercontent.com/assets/170528/5179782/037377f0-74c6-11e4-8c78-c94395bc62a3.png)

![b](https://cloud.githubusercontent.com/assets/170528/5179784/05d1aa4e-74c6-11e4-9933-707b72ad99f6.png)

![c](https://cloud.githubusercontent.com/assets/170528/5179785/07f76304-74c6-11e4-8214-0cdc50b7efe7.png)