Co-authored-by: Confiks <confiks@scriptbase.org>

Co-authored-by: Confiks <confiks@scriptbase.org>

fix: Make irma scheme verify fail when specific folder isn't a scheme, and also doesn't contain any subfolders.

Fixes #25

Co-authored-by: Koen van Ingen <koenvaningen@gmail.com>

JWTs use URL-encoded base64 (with - _ instead of + /). This fixes parsing bugs
that would occur when issuing attributes containing certain non-alphanumeric
characters like ~.

Fixes #24.

Co-authored-by: Koen van Ingen <koenvaningen@gmail.com>