Add type summaries to recognise instances of Mime::Type, and recognise
arguments to Mime::Type.match? and Mime::Type.=~ as regular expression
interpretations.
Make ActionDispatch::Route into a private class
ActionDispatch::RouteImpl, defining a new class Route which exposes the
necessary public API from RouteImpl.
Also rename getHTTPMethod to getHttpMethod.
Add `Route` classes which model Rails routing information, typically
defined in a `routes.rb` file. We extract only the most basic
information: HTTP method, path, controller and action. This is enough to
determine whether a given controller method is a route handler, and what
HTTP method it handles, which is useful for, among other things, the URL
redirect query.
