The underlieing problem is that Firefox ignores the css 'white-space:pre'
rule when actually copying and pasting. This Javascript turns newlines
into <br /> tags inside the code containers.

This will run in Safari, Opera, Chrome, Webkit, etc. gracefully.
This will not run in IE due to IE not having the methods needed.

A permanent solution would be at the Markdown level in such a way that
the highlighter still runs on the output with brake tags.

suggests using Hash#(except|slice) to be able to implement access logic where attr_(accessible|protected) is not enough

This reverts commit 4e56cc2f.

Conflicts:
	actionpack/lib/action_controller/base/mime_responds.rb

Writing "form element" instead of "FORM element"

  A large number of the remaining failing tests have to do with
  the semantics of filters that are Objects. The right solution
  is probably to just implement the filter/before/after semantics
  in NewCallbacks directly (the current semantics are based
  on the old AS::Callbacks specs)

Created an ActionController::Renderers::All that includes all the default render options (:json, :js, :rjs, :xml)