Implement fancy progress bars configuration.

Ubuntu 14.04 ships with apt 0.9.15, has a ``fancy progress bar'', which
is a green bar that shows at the bottom of the terminal showing progress
throughout install.

This patch enables the progress bar, which is usually done by running
echo 'Dpkg::Progress-Fancy "1";' > /etc/apt/apt.conf.d/99progressbar
Merge pull request #287 from oc243/master

Implement fancy progress bars configuration.