pkcs11 uri reference implementation and p11-kit docs

[Stef Walter]

I worked on documenting some of the p11-kit stuff today. Here's the
documentation for the PKCS#11 URI reference implementation:

http://p11-glue.freedesktop.org/doc/p11-kit/p11-kit-URIs.html

And here's some docs for all of p11-kit, including the configuration
files, formats, etc.

http://p11-glue.freedesktop.org/doc/p11-kit/index.html

Cheers,

Stef