This change uses Bootstrap's existing `scss/.scss-lint.yml` file
to configure Hound's hosted SCSS-Lint instance.
On each pull request to Bootstrap,
Hound will comment on any SCSS style violations in-line, like this:

If you update the pull request to adopt a suggestion,
the comment will be hidden.
It leaves the existing linting done by Grunt + Travis.
Hound is free for open source projects
and is open source itself:
https://github.com/thoughtbot/hound