Add README
ap: use run-parts to run executables attached to vtun-up/down events
ap: verify api-server
ap-dnsproxy: new module for advertizing ap-specific services via dns-sd
Archive git HEAD to tarball with 'make dist'
ap-dnsproxy: move iptables command to puavo-wlanap-dnsproxy

Previously, when iptables was modified directly from vtun-up/down
scripts, iptables was modified even when puavo-wlanap-dnsproxy was not
running. Now scripts just notify the main daemon about vtun-up/down
events, and the daemon is responsible of applying necessary iptables
changes. If puavo-wlanap-dnsproxy is not running, nothing happens, as it
should be.