All configuration files and all messages files should now preferrable be
done in Hjson. This format supports, i.a. features, multi line strings
and commenting. This greatly improves readability.
All installation and documentation files are also updated in this
commit.
This plugin sets up a coupon on installation and sends this coupon to a
user that asks for it. The plugin supports an expiration period. After
this period, it will renew the coupon.
