Revoking certs through the API

Hello,

I've been trying to revoke a certificate using the API. A few things I noted:
- the format of the Serial and AKI in 'certinfo' is different from the expected args for 'revoke'
- I can't get the API to revoke it at all. This is probably some encoding / format issue, but using curl with the same arguments failed

``` json
{"success":false,"result":null,"errors":[{"code":11200,"message":"failed to revoke the certificate: certificate not found"}],"messages":[]}
```

I've tried using the hex, upper hex, lower hex formats. Using cfssl made it work, but only using a lowercase hex version; Personally I'd propose to make certinfo print a lowercase, "%0x" version without the colons.

PS: do you have a chat channel / FAQ?