parser: Propagate errors to the root parser

Thanks to Arnavion on Mozilla#rust for clueing me into this:

> The documentation starts with "A parser in this library can be
> described as a function which takes some input and if it is
> successful, returns a value together with the remaining input."
> Key phrase being "with the remaining input"
> So I assume it just matches as best as it can (which is nothing, in
> your case)
> Maybe you want to use some one-or-more combinator rather than many
> which is a zero-or-more combinator
> Then add your own check that "the remaining input" is empty

Replacing my `many()` parsers with `many1()` correctly propagates errors
up from sub-parers. Nice!

This will fail when we try to parse an empty string, but we can just add
a special case for that to parse successfully.

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