Add Callouts to Bootstrap

These informational callouts are littered throughout the online Bootstrap documentation:

Bootstrap Callout

Figure: This is a nicely designed informational callout

They look great, and being used in the Bootstrap documentation I assumed they were part of Bootstrap as well. Unfortunately, they are not.

Please add these to Bootstrap as .callout, with the same contextual options as usual (.callout-default, .callout-primary, .callout-info, etc…)