Split up Travis tests into 2 auth and non-auth tasks

[miketaylr]

That way forks w/o access to the encrypted ENV VARs can run the non-auth tasks (and nosetests, etc.).

See https://docs.travis-ci.com/user/pull-requests#Security-Restrictions-when-testing-Pull-Requests

[miketaylr]

So, despite merging myself and breaking things for a few minutes, this is working now:

(I can hear @karlcow going tsk tsk all the way from Tokyo...)

[miketaylr]

this is working now:

Heh, sort of. Have to make that a non-exiting conditional.