Dockerfiles

Only Dockerfiles for build images so far. Will most certanly put some other useful Dockerfiles here later.

NOTE

To make things easy for myself I've added a cheecky siverten/ folder for stuff I've got on DockerHub. Most of them are automagically built with scripts on my servers so this is absolutely fantastick! I would also love for anyone to contriblute, but for the time being this is hosted on my very own, pretty obscure git server.