Add jimdo-debian-7.0.0 definition

	$ veewee vbox define jimdo-debian-7.0.0 Debian-7.0-amd64-netboot
Adjust RAM and disk size
Fetch Debian packages from cdn.debian.net
Document new jimdo-debian-7.0.0 base box
Merge pull request #5 from mlafeldt/debian-7

Add jimdo-debian-7.0.0 box