slider: added warning div where needed
slider: converted the example from xhtml to html
Includes: pre-rendered: Add ID to heading.
Pagecontainer: Rename from "Page container" to "Pagecontainer".
Collapsibleset: Removing references to "collapsible set" and changing some of the wording a bit.
Moving grid-layout and responsive-grid to category css-framework.
categories.xml: Getting rid of category "misc".