- generalize, to make it more clear that the site config
   needs to be adapted to the local community.
 - remove some host names and public keys used in Lübeck
 - suggest private space mac adresses
 - change fastd method to salsa2012+umac, which is the recommended default
 - add config for a fastd peer reachable by both ipv4 and ipv6
 - order GLUON_SITE_PACKAGES alphabetically

Add support for Netgear WNDR3700/3800

Signed-off-by: flokli <florian@darmstadt.freifunk.net>

Signed-off-by: flokli <florian@darmstadt.freifunk.net>

site.rst -> Add Mayen-Koblenz

site.rst -> Fix Göttingen

+goettingen

This fixes `make update` not working correctly when GLUON_SITEDIR is set
manually.

correct site-ffmwu

This adds the new macro GluonProfileFactorySuffix which can be used to override
the factory images suffix ".bin". When the suffix is set to the empty string
Gluon will assume that there are no factory images.

docs: typo

contrib/sign.sh - a bit more help

docs: update supported devices, reorder them alphabetically and fix a mo...