travis-ci/travis-hub — pull request #35 by meatballhat (2014-10-13 02:43:38+00:00)
Title: Only set ruby in Gemfile when on Heroku

as this is the only deployment environment where doing so really
makes sense, IMHO, as Heroku depends on the declaration to do
*special things*, whereas other deployment environments will simply
use the available ruby and no version restriction in the Gemfile is
really necessary.