Added request and controller objects to the hooks by default.

The request and controller objects are now added to all hook contexts by
default.  This will also make url_for work better in hooks by setting up
the default_url_options :host, :port, and :protocol.

Finally a new helper method @render_or@ has been added to ViewListener.  This
will let a hook easily render a partial without a full method definition.

Thanks to Thomas Löber for the original patch.  #2542

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@2429 e93f8b46-1217-0410-a6f0-8f06a7374b81