facebook/react — pull request #2732 by zpao (2014-12-17 18:46:18+00:00)
Title: Use containers on TravisCI

This *should* enabled the caching of node_modules for faster builds. We
may need to tweak this later to make sure node_modules gets updated

See http://blog.travis-ci.com/2014-12-17-faster-builds-with-container-based-infrastructure/