Fix /var/www permission when running Ansible provisioning with www-data.

Since user www-data setting its $HOME to /var/www but the directory has
root as its user and group, making the directory actually unwritable by
www-data and causing npm and pip installation to fail.

We don't really care about /var/www as we use /srv/http for actual root.
Let's bite the bullet and test on 3.3 too.

Screw the let's-drop-3.2-support-and-support-3.3 movement and everything
about it. Let's make our code at least 3.3 compatible.