update close button example display
Run make on JS
Overall responsive `img` styles

`img`s are no longer responsive by default. Instead, use
`.img-responsive` as a class or mixin. Existing `.thumbnail > img` and
`.img-thumbnail` classes now make use of this as a mixin as well.
Merge branch '3.0.0-wip' into 3.0.0-sass-wip

Conflicts:
	docs/assets/css/bootstrap.css