enable gnutls in ffmpeg build to handle https:// streams
put myself in the maintainer field
and add to the copyright file
enable caca in the debian pacakge - in a silly mood
tweak debian build instructions

includes recommending dpkg-buildpackage over debuild (which does more
stuff that's probably not applicable to a local user build).
remove the trailing / from subrepositories in .gitignore
this allows them to be symlinks without making noise in git status
remove wrong pluralisation in README
move the ./update command to before mk-build-deps in debian instructions

This covers the case of changed build-dependencies in the debian package.
update