Docs: create new callout classes
Adjust info callout, add callouts to docs

* Adjust the background-color of bs-callout-info to match danger and
warning in tone
* Convert all the callouts
* Change some callouts to info/warning
* Add new callout
Merge branch '3.0.0-docs-calloutfam' of https://github.com/juthilo/bootstrap-wip into juthilo-3.0.0-docs-calloutfam

Conflicts:
	docs/components.html
	docs/css.html
	docs/customize.html