Created by: brianfeister
A followup from this pull request:
https://github.com/twitter/bootstrap/pull/4386#issuecomment-7849402
Looks like I missed the boat on 2.1.0-wip, and there were some changes to popovers in 2.1.0 release, this fixes the compatibility issues and handles it without the confusing math. Also added a few examples of custom styling to javascript.html docs.