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)


I think we should do these serially, and I think the order should be:

1.  merge account:  If we fail _after_ this step, the account will simply look unfunded
2.  delete wallet: if we fail after this step, the user will not be able to login again, but the name will not be released
3.  delete user: the name is released