travis: cosmetic improvements to travis.yml.in.

* travis.yml.in: Cosmetic improvements.
* .travis.yml: Regenerate.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>
travis: let specl take care of itself.

* travis.yml.in (SPECL): Remove all references.
* .travis.yml: Regenerate.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>