Updated the Travis CI configuration to clone a complete cmcstl2 repo.  This is needed so that a last known good commit can be checked out after cloning.
Updated the Travis CI configuration to clone a complete cmcstl2 repo.  This is needed so that a last known good commit can be checked out after cloning.

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