This setting should ensure that email notifications are sent
*only* when the commit caused the build to start failing. That
is, no more "the build is still failing" spam.
As an alternative we could consider disabling email
notifications outright and possibly enable IRC notifications
instead.
This reverts commit 3c0fdefd84.
We have to keep more history because travis build could be
triggered after new commit is made, meaning it won't be able
to checkout the repository.
This will make travis only fetch the top level commit instead of
fetching the top 50 (default). Nox should be able fetch other commits on
an as-needed basis.
This adds a 3rd matrix to be built by Travis. The new matrix "checks"
the NixPkgs evaluation so the other 2 can save their resources for
building. Hopefully, this will lead to less "out of space" errors that
seem to be happening with Travis. Also adds folding.
