Merge pull request #4 from FreifunkBremen/master

alfred: added more information to send, reformatted location
gluon-mesh-batman-adv: disable client interface in dnsmasq
Remove initscript enable/disable hacks

Better configure these properly.
gluon-config-mode: use different document root
Add firewall rules

gluon-mesh-batman-adv should not be used without firewall to prevent forwarding
of packets from the mesh to the wan interface.

For some reason, the firewall package won't work at all without
kmod-ipt-nathelper.
gluon-core: add function to add users
gluon-mesh-vpn-fastd: don't run as root
fastd: fix creation of PID file as non-root user, add secure_handshakes to example config
gluon-radvd: don't run as root
gluon-mesh-vpn-fastd: enable secure handshakes
alfred: add statistics (uptime+traffic)