twitter/bootstrap — pull request #4693 by rubenrails (2012-08-24 21:14:10+00:00)
Title: Fixed left margin on btn-group's buttons to avoid double borders

Button groups in navbar show double border between buttons

Problem: http://jsfiddle.net/rubenrails/qUR76/3/
Fixed: http://jsfiddle.net/rubenrails/qUR76/4/

Fixes #4692