Change path matching

[AndrewBurian]

Change the way path matching works to be closer to the latest definition from http.ServeMux

• Drop the * param in favour of using trailing slashes to indicate rooted trees
• Rework the Route syntax to make this apparent

mux.Handle("/", h) should handle all paths without a more exact match, as it does in the go mux. Right now this is only achieved via mux.Handle("/*", h) and requires another definition for the root itself.

mux.Handle("thing", h) and mux.Handle("thing/", h) should differentiate between only an exactly match of thing and thing/* respectively. Without the exact definition, the rooted tree will also match thing directly.

Both thing AND thing/ should be able to be defined separately, as the go mux does, and result in different handlers. Being able to do this with the Route() syntax is challenging.
A possible implementation:

// registers a and b/ with no specific separate b handler
mux.Route("a").Route("b/")

// registers a, b, and b/
a := mux.Route("a")
a.Route("b")
a.Route("b/")

This is more confusing when the rooted tree comes in the middle of a chain

// Will register handlers for a, b/, and c, with no specific handler on b
mux.Route("a").Route("b/").Route("c")

// Requests to /a/b will go to the b/ handler