Be able to create aquariums

[obiwac]

This proposal has been superseded by the one in inobulles/aquarium#48, and that's what #86 is going along with.

Old proposal

Would be cool to be able to create aquariums out of a simple build.fl script like this:

let aquarium = Aquarium("amd64.aquabsd.0.1.0-beta")
aquarium.kernel = "amd64.aquabsd.0.1.0-beta"

aquarium.map = {
   "rc.local": "/etc/rc.local",
}

aquarium.env["IGNORE_OS_VERSION"] = true
aquairum.env["ASSUME_ALWAYS_YES"] = true // Probably should always be set at least by 'pkg_install'.

aquarium.pkg_install("vim")
aquarium.exec("ln -s /tmp/installer/resolv.conf /etc/resolv.conf")

aquarium.register()

And then you could have the following commands:

bob aquarium template # create template
bob aquarium image # create bootable image