New dependency: GnuTLS

[Uwe Korn]

Hello,

we have a new dependency in master, GnuTLS [1] which is currently used for the generation

of a self-signed certificate so that we serve the (local) Web/Playdar API via https but may

be used in future for further tasks.

Thanks

Uwe

PS: We hopefully announce very soon a 0.8 release ;)

[1] http://gnutls.org