* This fails two of the tests.  We should probably add a catch all
    at the end that captures anything not matches by the Symbols for
    the preceding branches `arms` and `legs`.
  * When using `CaptureAll` from the root "/" and empty path becomes
    an empty list.  when using it from a branch though an empty path,
    ie. a trailing separator, becomes `mempty` for the type.  Where is
    this happening?  I think this is definitely happening before
    `parseUrlpieces` gets run, so it happens in the machinery for
    Delayed and DelayedIO.  I am still looking for the code that
    produces the `txts` argument for the `captureD` lambda created in
    the `HasServer` instance for `CaptureAll`.

  * Routes ending in a `CaptureAll` now get an empty list instead of
    [""] when they have a trailing slash.
  * WARNING: I think this will break the expectation that a rooted
    capture all will produce [""] for `//`.  That is, previously `// =>
    [""]`, but I think `// => []`.  I will make some tests to check
    and see what is going on with this.

  * Trailing slashes will no longer affect the captures for "rooted"
    CaptureAll apis (test included).