travis: prepare for additional builds
authorSitsofe Wheeler <sitsofe@yahoo.com>
Wed, 15 Feb 2017 18:44:48 +0000 (18:44 +0000)
committerSitsofe Wheeler <sitsofe@yahoo.com>
Thu, 16 Feb 2017 07:04:11 +0000 (07:04 +0000)
Prepare the .travis.yml file to accept new builds by making the Linux
OS choice more explicit and protecting some Linux specific steps.

Signed-off-by: Sitsofe Wheeler <sitsofe@yahoo.com>

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