Fix '/etc/fstab' after partitioning.
Use 'iptables' command to configure proxy.

Instead of creating a file with a set of firewall rules, use the
'iptables' command instead.
Merge pull request #20 from omaciel/fix-fstab

Fix '/etc/fstab' after partitioning.
Merge pull request #21 from omaciel/fix-proxy-task

Use 'iptables' command to configure proxy.