gruntjs/grunt-contrib-concat — pull request #96 by Toilal (2014-09-04 08:10:04+00:00)
Title: Update sourcemap generation for valid line number mapping. Fix #94

For more information, please read the excellent comment of @lydell at https://github.com/mozilla/source-map/issues/132#issuecomment-54353746.

This commit fix debuging issues when using sourcemaps generated from grunt concat.