Json config and fix py3

[vext01]

Richard,

Can youhave a quick look at this.

• Use a JSON config file.
• Fix tests on Python3 (includes a workaround for one issue which is a mystery).

You will need to update your config file, but it is trivial. Something like this in passout.json (note new file name also):

{                                                                               
    "id": "jim@bob.com",                                               
    "gpg": "/usr/local/bin/gpg2"                                                
}   

Once this is in, I will add travis to PRs.

[richlanc]

No issues, looks good.