RouteSet#url_for was modifying the options hash that belong to the
caller

constraints on the querystring. Issue #2781

`ActionController.force_ssl` redirects http URLs to their https equivalent;
however, when a URL contains a query string, the resulting redirect lacked the
original query string.

Conflicts:

	actionpack/lib/action_controller/metal/force_ssl.rb

Fix url_for method's behavior when it is called with :controller option which starts with "/" from multiple nested controller.

Closes #3864

symbol nodes.  Fixes #4585

Clean up routes inclusion and add some comments for the next soul that decides to adventure on this code.

rather than casting

worry about "inspect" marshalling

ivars in clear!

Named Routes shouldn't override existing ones (currently route recognition goes with the earliest match, named routes use the latest match)