Windows CLI prove -o failed to create file. Need to revoke the proof.

I am attempting to add proofs using the Windows CLI.
I first added github with

```
keybase prove github
```

and walked through the process of creating a gist successfully. However, it was a bit challenging as the output is taller than my CLI window, so I had to copy the output to the gist in two chunks. Since the help for prove offers the -o [outfile.name] flag, I figured I would learn my lesson and do that with the next proof.

Unfortunately,

```
C:\Program Files (x86)\Keybase>keybase prove -o twitter.proof twitter
Your username on Twitter: mattofnowhere
Please publicly tweet the following, and don't delete it:
- INFO Writing proof to file 'twitter.proof'...
- INFO Written.
Check Twitter now? [Y/n] n
- ERROR Proof wasn't available; we'll keep trying

C:\Program Files (x86)\Keybase>dir
Volume in drive C has no label.
Volume Serial Number is C8EB-4C62

Directory of C:\Program Files (x86)\Keybase

03/25/2016 03:43 PM .
03/25/2016 03:43 PM ..
03/11/2016 11:02 AM 29,225,840 keybase.exe
03/25/2016 03:43 PM 4,709 unins000.dat
03/25/2016 03:43 PM 1,214,832 unins000.exe
03/25/2016 03:43 PM 22,553 unins000.msg
4 File(s) 30,467,934 bytes
2 Dir(s) 124,636,549,120 bytes free
```

As you can see, while the command states that it created the file, the file is not in the directory. I used a windows explorer search (Win10) to search my entire C: drive for the file and did not find it. Without the contents of this file, I cannot complete the proof by posting it in my twitter account.

As it happens, this is the wrong twitter account to use, anyway, since it is not a public account.
Since I will never complete the proof, I now need to cancel the process, or revoke the proof. I cannot find any sign of the command to do this in the output from keybase help.

Please let me know:
1. how to make sure I get an actual output file from keybase proof -o
2. how to revoke this proof

In case it helps,

```
C:\Program Files (x86)\Keybase>keybase -v
keybase version 1.0.14
```

Reproduce the Windows CLI commands shown, especially `keybase prove -o twitter.proof twitter`, and compare the reported output path with the directory listing. Read the `prove` and help output for file handling and revocation; done means the output file is created where documented and an unfinished proof can be revoked.

Written by the indexing model from the issue text.