Added Assembly.GetLoadableTypes() that the other methods use to get types that can be loaded.

Added FileInfo.Rename
Addeed AjaxNoCacheFilter that marks all ajax requests as no cache
Added RequireSourceHost Attribute that when applied to an action, prevents its calling if it doesn't come from the specified source.

Added Robots.txt handler. Add attributes to disallow actions, areas, or controllers.
Added extension on RouteCollection to register robots.txt route.
Added the new files to MVC3 & MVC4 projects