Bugfixes to serial/records management, Supervisor support for Linux

This release brings two improvements and one notable regression:

• zeronsd supervise and zeronsd unsupervise can be used to automatically join a zeronsd to your network through systemd. Must be on linux and using systemd to use appropriately.
• Several issues with managing the catalog were fixed.
• IPv6 support is currently on further hold until 0.2.x ships. This is because it needs a significant rework for how users use IPv6 with zerotier. We apologize if there is anyone depending on the existing functionality; for what it's worth, it should improve soon.
• Diagnostics for when records are added/removed to the catalog were also added.

v0.1.2: Windows Support

This includes windows packages and also bumps the dependencies in trust-dns which contain fixes for forwarding requests on windows hosts.

This still does not address service installation in any of the packages; expect more soon on that front. The MSI installer will install the binary and adjust your path, but that's about it.

Feedback on these releases is always welcome.

Note: homebrew and docker should also be updated.

Several improvements + packages & docker images

Docker images are coming to dockerhub. There are also instructions in the README that describe how to build your own.

rpms and debs are included in this release as well. They do not configure any init scripts, however. Just installation of the binary and pulling in of dependencies. Let us know in the issues if you want/need more.

Additionally, the following changes were made:

• whitespace in central's named hosts is now trimmed for DNS usage. Additionally, empty and invalid strings will no longer cause an inscrutable error every 30 seconds. Now you will know what is wrong.
• Core dependencies were updated; trust-dns was updated to 0.20.2.

Initial tagged release

Add metadata to generated code this won't bite us later woo

Signed-off-by: Erik Hollensbe <linux@hollensbe.org>