.gitignore: ignore local untarred copy of distro

As part of building this docker, the directory wheezy is used to hold
the new filesystem. In it's untarred state we don't want it in the repo.

Signed-off-by: Paul Campbell <paulcampbell@fife.ac.uk>
Dockerfile: add missing newline at end of file

It just looks better when you cat the file!

Signed-off-by: Paul Campbell <paulcampbell@fife.ac.uk>
wheezy.tar.bz2: derp! remove stray copy of wheezy.tar in root

Signed-off-by: Paul Campbell <paulcampbell@fife.ac.uk>