twitter/bootstrap — pull request #4439 by BMorearty (2012-08-17 20:57:35+00:00)
Title: Fix nabar responsive width

`responsive-navbar` was adding 5px padding to the top, bottom, left, and right of the navbar when < 979px.

This was causing the navbar to get "fatter" (taller) when resizing the window to a narrower width.

The fix: only add the padding to left and right.

P.S. I don't understand why the hotfix by @markdotto is included in this pull request. I branched off 2.1.0-wip as I should, but for some reason the hotfix commit shows up there anyway. :-(