twitter/bootstrap — pull request #5738 by 8heaven (2012-11-01 14:06:59+00:00)
Title: Fixed background issue for default buttons when changing $btnBackgroundHightlight value

Fixed default button background issue: you cannot change default button background to other than default just changing bootstrap variables values.
It happens due to unwanted style overriding at `buttons.less` button style of `.btn:hover` state.

Also `buttons.less:31`, `buttons.less:33`, `buttons.less:34` lines don't respect button colors variables (for easy color scheme changes).