When the application path info is empty (e.g. the WSGI script is mounted
somewhere other than the root), appending a trailing slash and redirecting
causes the new location to be calculated incorrectly. This is because the part
of the request URL before the application path is not taken into account, so
the new path always ends up being a literal `/`. This commit changes the
behavior of the `redir` function that is returned by
`milla.dispatch.routing.Router.resolve` to calculate the new path info
correctly in the redirect response.
* Created a dispatcher protocol for classes to implement for path resolution
* Implemented a traversal dispatcher
* Updated the router to implement the dispatcher protocol
* Added unit tests for both dispatchers
* Replaced the Controller class with an Application class
Dustin C. Hatch