This patch greatly enhances and refines the ActionPack README; per our style guidelines for the documentation project, READMEs will contain high level overview documentation whereas class documentation will contain low level details and examples. As such, all the examples were torn out of the README and will be placed in their proper class; in their stead is narrative exposition of the concepts behind these components with pointers to other documentation.
I realize it points to a lot of mythical documentation in the ActionController:: and ActionView::Base classes; I'm working on that, so bear with me. :)