Add a function for parsing all remaining path segments.

[EdSchouten]

Having an operation like this is useful for cases where you need to forward/process arbitrary requests for a certain path prefix. While there, make a tiny cleanup to the parser by removing an unused field in the parser state.

Fixes: #9

[bmillwood]

ah, I noticed the same thing as you with the unused visited field and made #50 before I realized it was here as well.