twitter/bootstrap — pull request #3895 by EngineerGio (2012-06-20 22:54:00+00:00)
Title: Added border-radius mixins to set single corne and single side radius

These mixins may not be necessary for the classes in the framework, but can be useful when the mixin file is used as a source of _"snippets of reusable CSS to develop faster and keep code readable"_