Delete account and transfer balance setting

Delete account and transfer remaining balance.

Fixes #10.

![output_hz2q9s](https://cloud.githubusercontent.com/assets/3108007/5307772/0d8ac5f8-7bc5-11e4-9bf3-adb9a5dab2c8.gif)


Present the error to the user and let them try again, skipping the account merge if it was successful