[PATCH v3] Enable Travis-CI as a backup continuous integration service.

[David Bremner]

"Wael M. Nasreddine" <wael.nasreddine at gmail.com> writes:

> You can access the dashboard at https://travis-ci.org/notmuch/notmuch

pushed; not sure if you need to do anything else to get it started. I
waited a whole 7 minutes ;).

d