twitter/bootstrap — pull request #8438 by jtheoof (2013-07-10 14:46:25+00:00)
Title: Add support for source maps

- Upgrade uglify-js dependency to 2.3.6 to get all the benefits from
source maps generation
- Reorder a few things in the build system in order for source maps to work
properly.

Source maps allow the newest browsers to find development sources from
minified code (among other things).