Get "the rest" of a URL

[evancz]

A couple issues and pull requests have asked for something like this:

remainingSegments : Parser (List String -> a) a

Here they are:

• #38 -espa%C3%B1ol in hash in Safari, but español in Chrome
• #25 - use for "not found" path
• #34 - some sort of authentication redirect scheme
• #46 - example that wants this