twitter/bootstrap — pull request #4848 by Barryvdh (2012-08-30 08:06:17+00:00)
Title: New image replacement approach (h5bp)

Follow the h5bp image replacement approach, as committed on https://github.com/h5bp/html5-boilerplate/commit/adecc5da035d6d76b77e3fa95c6abde841073da2 by @necolas