Re-worked the "last known good" Travis CI build configuration.
Re-worked the "last known good" Travis CI build configuration.

It turns out that Travis CI caches are not shared across build jobs.  The
prior configuration was intended to automatically bump the "last known good"
commit as builds succeeded with newer commits.  Now, the "last known good"
build will only exercise a statically encoded commit tag.

tahonermann/text_view,tahonermann/text_view,tahonermann/text_view-range-v3,tahonermann/text_view-range-v3