craigcitro/r-travis — pull request #78 by krlmlr (2013-11-09 23:09:55+00:00)
Title: r-binary-install uses r-install as fallback if not running Linux or FORCE_SOURCE_INSTALL is set

- avoids clutter in the `.travis.yml` when testing for Linux and OS X
- allows the user to choose not to install from c2d4u